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.
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Question: Category: THE QUOTABLE EINSTEIN 
Clue: This "is more important than knowledge"

Answer: imagination


Question: Category: ZOOLOGY 
Clue: Unlike the octopus or squid, the nautilus may have up to 90 of these armlike appendages

Answer: tentacles


Question: Category: HEALTH & MEDICINE 
Clue: Studies suggest oat bran is about as effective as the drug Colestipol at reducing blood levels of this

Answer:
cholesterol