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: MILITARY HISTORY 
Clue: Lasting about a month, it's the battle for which the most marines earned the Medal of Honor
iwo jima

Category: ANIMALS 
Clue: Odobenus, the genus name of this animal, comes from the Greek for "one who walks with his teeth"
walrus

Category: AMERICAN WOMEN AUTHORS 
Clue: Henry James called her "the Thackeray, the Trollope, of the nursery and the schoolroom"

louisa may alcott