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.

What episode of supergirl does she meet the flash?
Worlds Finest

Who led the us movement to take over the island of hawaii?
John Leavitt Stevens

When was the word internet of things coined?

1999