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: "TRIPLE" JEOPARDY! 
Clue: Collective term for victories in horse racing's 3 major events
triple crown

Category: KNOW YOUR BIBLE 
Clue: Noah's Ark was made of gopher wood & measured 300 of these units in length
cubits

Category: O CAPTAIN! MY CAPTAIN! 
Clue: This author drew on his experiences as captain of a west African river steamer for "Heart of Darkness"

joseph conrad