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: POP "I" 
Clue: We have a feeling you'll know that it was the first single from Jewel's "0304" CD
[EX A]: intuition

[EX Q]: Category: CHOOSE A "CIDE" 
Clue: The killing of cats
[EX A]: felicide

[EX Q]: Category: PHYSICS 
Clue: Plano-convex, biconvex & concavo-convex are 3 of the types of this optical component
[EX A]:
lens