TASK DEFINITION: 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.
PROBLEM: How many series are there of the mentalist?

SOLUTION: 7

PROBLEM: In what movie did the song white christmas make its debut?

SOLUTION: Holiday Inn

PROBLEM: First new zealander to run a mile in under four minutes?

SOLUTION:
John Walker