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: Who is playing black panther in the new movie?

SOLUTION: Chadwick Aaron Boseman

PROBLEM: Who sang the original version of earth angel?

SOLUTION: The Penguins

PROBLEM: Who has won the most men's tennis grand slam titles?

SOLUTION:
Roger Federer