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.

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

Category: AMERICAN HISTORY 
Clue: Frances Willard, a president of the WCTU, was the first woman honored in this Capitol building hall
statuary hall

Category: CLASSIC SCI-FI & HORROR FILMS 
Clue: Before he was Spock, he had a small role in the mutant ant infestation classic "Them!" in 1954

nimoy