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.

[EX Q]: Category: LEGENDS 
Clue: The "Literature Lover's Book of Lists" says this engineer "blew his train whistle in a special way"
[EX A]: casey jones

[EX Q]: Category: "W"HODUNNIT? 
Clue: He was the first U.S. president to be unanimously elected
[EX A]: george washington

[EX Q]: Category: TV STARS 
Clue: "3rd Rock From The Sun" is this Oscar nominee's first sitcom
[EX A]:
john lithgow