TASK DEFINITION: Given a question and its paraphrases, answer the question. The answer should exactly answer all the questions given without any ambiguity. Don't give partial answers.
PROBLEM: Questions: ['when was christopher columbus married?', 'when did christopher columbus get married?']

SOLUTION: 1479

PROBLEM: Questions: ['when is justin bieber birthday?']

SOLUTION: 1994-03-01

PROBLEM: Questions: ["what was avi's first book that he wrote?", "what was avi's very first book?", "what was the name of avi's first book?", 'what was the first book avi wrote?', 'what was the first book of avi?']

SOLUTION:
things that sometimes happen