You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For consistency, answers should be in all lower cased letters.

Category: PLANE CRAZY 
Clue: On August 6, 1945 this B-29 airplane became the first to drop an atomic bomb in warfare
the enola gay

Category: ANIMALS IN LITERATURE 
Clue: This knight errant's steed in Rocinante, a draft horse originally belonging to his neighbor
don quixote

Category: EGGHEADS 
Clue: Since 1963 this British title character has traveled through time & space in a device called the TARDIS

doctor who