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 consistency, answers should be in all lower cased letters.

Input: Consider Input: Category: SEX CHANGES 
Clue: Don't let the pearls fool you, these lady bivalves can change into males when it suits them

Output: oysters


Input: Consider Input: Category: SPORTS SCORES 
Clue: In volleyball, only the side who did this at the beginning of play can score a point

Output: serve


Input: Consider Input: Category: "B" YOUR BEST 
Clue: An athletic competition combining skiing & shooting


Output: a biathlon