instruction:
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.
question:
Who played keyboard on the beatles rooftop concert?
answer:
Billy Preston


question:
When was the first constitution of pakistan passed?
answer:
March 1956


question:
When did west indies won t20 world cup?
answer:

2012, 2016