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: -OLOGIES 
Clue: From the Greek for "growing in", it studies the development of organisms in their earliest stages before birth
[EX A]: embryology

[EX Q]: Category: FUTURISTIC FILMS 
Clue: 1 of 2 races Rod Taylor meets circa 800,000 A.D. in "The Time Machine"
[EX A]: elois

[EX Q]: Category: ART & ARTISTS 
Clue: An X-ray of his "Blue Boy" has revealed the figure of a small dog that was painted out
[EX A]:
thomas gainsborough