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: A DELICATE OPERATION 
Clue: A bypass operation may bypass the carotid or coronary one of these

A: artery
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Q: Category: PHOTOGRAPHERS 
Clue: Best known as a writer of children's stories, he was also a fine photographer; Alice Liddell was a subject

A: lewis carroll
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Q: Category: CHEETAHS 
Clue: Of 35, 70 or 140 MPH, it's a cheetah's top speed in bursts of a few hundred yards

A:
70
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