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: ANIMAL VERBS 
Clue: Nag or pester persistently
answer:
badger


question:
Category: CLASSICAL MUSIC 
Clue: Mendelssohn's "Songs without Words" were once the most popular pieces for this instrument
answer:
piano


question:
Category: BALLET 
Clue: In an 1870 Delibes ballet, Swanilda, the heroine, gets all dolled up to impersonate this title doll
answer:

coppelia