question: What treaty signed by the Central Powers signed after their defeat in World War I did Rıza Tevfik Bölükbaşı sign?
answer: Treaty of Sèvres
context: Title: Treaty of Brest-Litovsk (Ukraine–Central Powers)
  Passage: The Treaty of Brest-Litovsk was a peace treaty signed on March 3, 1918 between the Russian SFSR and the Central Powers, but prior to that on February 9, 1918, the Central Powers signed an exclusive protectorate treaty (German: "Brotfrieden" , "peace for bread") with the Ukrainian People's Republic as part of the negotiations that took place in Brest-Litovsk, Grodno Governorate (now Brest, Belarus) recognizing the sovereignty of the Ukrainian republic.  Although not formally annexing the territory of the former Russian Empire, Germany and Austria-Hungary secured food-supply support in return for providing military protection.  The Quadruple Alliance recognized Ukraine as a neutral state.
  Title: Treaty of Sèvres
  Passage: The Treaty of Sèvres (French: "Traité de Sèvres" ) was one of a series of treaties that the Central Powers signed after their defeat in World War I.  Hostilities had already ended with the Armistice of Mudros.  The treaty was signed on 10 August 1920, in an exhibition room at the Manufacture nationale de Sèvres porcelain factory in Sèvres, France.
  Title: Rıza Tevfik Bölükbaşı
  Passage: Rıza Tevfik (Rıza Tevfik Bölükbaşı after the Surname Law of 1934; 1869 – 31 December 1949) was a Turkish philosopher, poet, politician, and a community leader (for some members among the Bektashi community) of late 19th century and early 20th century.  A polyglot, he is most remembered in Turkey for being one of the four Ottoman signatories of the disastrous Treaty of Sèvres, for which reason he was included in 1923 among the 150 personae non gratae of Turkey, and he spent 20 years in exile until he was given amnesty by Turkey in 1943.
  Title: Treaty of Versailles
  Passage: The Treaty of Versailles (French: "Traité de Versailles" ) was the most important of the peace treaties that brought World War I to an end.  The Treaty ended the state of war between Germany and the Allied Powers.  It was signed on 28 June 1919 in Versailles, exactly five years after the assassination of Archduke Franz Ferdinand.  The other Central Powers on the German side of World War I signed separate treaties.  Although the armistice, signed on 11 November 1918, ended the actual fighting, it took six months of Allied negotiations at the Paris Peace Conference to conclude the peace treaty.  The treaty was registered by the Secretariat of the League of Nations on 21 October 1919.
  Title: Treaty of Hünkâr İskelesi
  Passage: The Treaty of Hünkâr İskelesi (once commonly spelled Unkiar Skelessi, and translating to The Treaty of "the Royal Pier" or "the Sultan's Pier") was a treaty signed between the Russian Empire and the Ottoman Empire on July 8, 1833, following the military aid of Russia against Mehmed Ali that same year.  The treaty brought about an alliance between the two powers, as well as a guarantee that the Ottomans would close the Dardanelles to any foreign warships if the Russians requested such action.  The treaty would have significant consequences regarding the Ottoman Empire’s foreign relations, especially with Great Britain and Ireland, as the terms of the treaty worried the other great powers of Europe.
citations: Rıza Tevfik Bölükbaşı Treaty of Sèvres