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: When was the canadian charter of rights and freedoms passed?

SOLUTION: April 17, 1982

PROBLEM: When did arches national park become a national park?

SOLUTION: November 12, 1971

PROBLEM: Who revived the ganesh chaturthi festival in maharashtra?

SOLUTION:
Lokmanya Tilak