instruction:
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.
question:
Category: DISSECTING MR. FROGGIE 
Clue: In Froggie's skull, you'll find the olfactory nerve that helped him smell & this main nerve that helped him see
answer:
optic nerve


question:
Category: GLAND FINALE 
Clue: This human gland important in the immune system takes its name in part from its resemblance to an herb
answer:
the thymus gland


question:
Category: "OO" WHO? 
Clue: He's the subject of the biographies "Official and Confidential" & "The Man and the Secrets"
answer:

j. edgar hoover