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 simplicity, answers should be in all lower cased letters.

[Q]: Category: PEOPLE IN HISTORY 
Clue: The spear that killed him in 1779 sold at auction in 2003 for over $400,000
[A]: captain james cook


[Q]: Category: SPORTS BOOKS 
Clue: In 1998 the author of this controversial 1970 book was finally invited to play in a Yankees old-timers' game
[A]: \"ball four\"


[Q]: Category: ARTISTS 
Clue: She's seen wearing a rebozo in her 1937 "Self-Portrait Dedicated to Leon Trotsky"
[A]:
frida kahlo