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: In mahabharata who was father of chitrasena vrishsena?

SOLUTION: Karna

PROBLEM: Who wrote the song flight of the bumblebee?

SOLUTION: Nikolai Rimsky-Korsakov

PROBLEM: When did star spangled banner became the national anthem?

SOLUTION:
March 3, 1931