question: What Disney cartoon character first drawn by Iwerks stared in the animated short film "The Nifty Nineties"?
answer: Minnie Mouse
context: Title: Minnie Mouse
  Passage: Minnie Mouse is a funny animal cartoon character created by Ub Iwerks and Walt Disney.  She and Mickey Mouse were first drawn by Iwerks in 1928.  The comic strip story "The Gleam" (published January 19–May 2, 1942) by Merrill De Maris and Floyd Gottfredson first gave her full name as Minerva Mouse, although this is seldom used.
  Title: The Nifty Nineties
  Passage: The Nifty Nineties is an animated short film produced in Technicolor by Walt Disney Productions and released to theaters on June 20, 1941 by RKO Radio Pictures.  the animated short was directed by Riley Thomson and animated by Ward Kimball, Walt Kelly, Fred Moore, Claude Smith, David Swift, and Les Clark with effects animation by Art Fitzpatrick.  The film stars Mickey and Minnie Mouse and romanticizes the decade of the 1890s.
  Title: Steamboat Willie
  Passage: Steamboat Willie is a 1928 American animated short film directed by Walt Disney and Ub Iwerks.  It was produced in black-and-white by Walt Disney Studios and was released by Celebrity Productions.  The cartoon is considered the debut of Mickey Mouse and his girlfriend Minnie, although both the characters appeared several months earlier in a test screening of "Plane Crazy".  "Steamboat Willie" was the third of Mickey's films to be produced, but was the first to be distributed because Walt Disney, having seen "The Jazz Singer", had committed himself to producing the first fully synchronized sound cartoon.
  Title: Walt Disney's Classic Cartoon Favorites
  Passage: Walt Disney's Classic Cartoon Favorites is a series of DVDs by Walt Disney Home Video.  Each release would feature around one hour of "Disney" animated short films, grouped by a starring character or a theme.  It is based on the original Walt Disney Cartoon Classics line of videotapes of the 1980s.  As opposed to the chronological nature of the "Walt Disney Treasures" line, each release would feature various cartoons in no particular order.  The series featured a total of four waves of releases, between January 11, 2005 and April 11, 2006.  Another very similar line was "Walt Disney's Funny Factory".
citations: Minnie Mouse The Nifty Nineties