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 Q]: When was the first constitution of pakistan passed?
[EX A]: March 1956

[EX Q]: When did star trek the next generation first air?
[EX A]: September 28, 1987

[EX Q]: Who plays alex in wizards of waverly place?
[EX A]:
Selena Gomez