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.

In mahabharata who was father of chitrasena vrishsena?
Karna

Who has the best winning percentage in college football history?
Michigan

Who sings every little thing that you do?

Christopher Williams