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: What episode of supergirl does she meet the flash?

SOLUTION: Worlds Finest

PROBLEM: The most important mineral product of northern chile is?

SOLUTION: copper

PROBLEM: When did verizon center become capital one arena?

SOLUTION:
August 9, 2017