question: Who illustrated the book in which the film "Ferdinand" is based on?
answer: Robert Lawson
context: Title: Ferdinand (film)
  Passage: Ferdinand is an upcoming 2017 American 3D computer-animated comedy film produced by Blue Sky Studios and 20th Century Fox Animation.  It is based on Munro Leaf's children's book "The Story of Ferdinand" and directed by Carlos Saldanha, and stars the voices of John Cena, Kate McKinnon, Gina Rodriguez, Daveed Diggs, Gabriel Iglesias, Bobby Cannavale, David Tennant, and Anthony Anderson.
  Title: Manga Hero
  Passage: Manga Hero is an American publisher based in San Rafael, California that publishes graphic novels influence by Japanese manga.  The company’s stories typically involve heroic characters that usually come from a Jewish or Christian background.  Manga Hero’s current publications include "Paul: Tarsus to Redemption", written by Matthew Salisbury and Gabrielle Gniewek, as well as "Judith: Captive to Conqueror" and "Many Are Called" both written by Gabrielle Gniewek.  The writers are from John Paul the Great Catholic University in San Diego.  Sean Lam illustrated both series and lives in Singapore.  Sean also illustrated a single volume comic titled "It Takes a Wizard" published by Seven Seas Entertainment in 2009.  The organizers of World Youth Day 2011 recently announced that Manga Hero will launch a special comic titled "Habemus Papam!"  where 300,000 copies will be distributed during the event in Madrid.  This comic chronicles the life of Pope Benedict XVI and will be published in English and Spanish.  Manga Hero hired Regina Doman in 2012 to write a more detailed graphic novel biography of Pope Benedict XVI, also illustrated by Sean Lam, based on the World Youth Day 2011 book and also titled "Habemus Papam!"  In 2014, the publisher developed a full color graphic novel about Pope Francis written by Regina Doman and illustrated by Sean Lam.  Manga Hero is also developing graphic novels on Pope John Paul II and Maximilian Kolbe.
  Title: The Story of Ferdinand
  Passage: The Story of Ferdinand (1936) is the best known work written by American author Munro Leaf and illustrated by Robert Lawson.  The children's book tells the story of a bull who would rather smell flowers than fight in bullfights.  He sits in the middle of the bull ring failing to take heed of any of the provocations of the matador and others to fight.
citations: The Story of Ferdinand Ferdinand (film)