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.

Who has played for the most premiership clubs?
Andy Cole and Peter Crouch

Who wrote the song imagine by the beatles?
John Lennon and Yoko Ono

Which world war 1 military tactic resulted in a prolonged stalemate?

trench warefare