In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.

Ex Input:
Who is pyramid head in silent hill movie?

Ex Output:
Roberto Campanella


Ex Input:
Show me the cast of bonnie and clyde?

Ex Output:
Warren Beatty, Faye Dunaway, Michael J. Pollard, Gene Hackman, Estelle Parsons, Denver Pyle, Dub Taylor, Gene Wilder, Evans Evans, and Mabel Cavitt


Ex Input:
Montreal protocol aimed to reduce emissions that cause this?

Ex Output:

ozone depletion