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.

[EX Q]: Who wrote the patriotic song sare jahan se achcha?
[EX A]: Muhammad Iqbal

[EX Q]: When does arrow season 6 air on tv?
[EX A]: October 12, 2017

[EX Q]: Who was it that developed the world s first electric ceiling fan?
[EX A]:
Philip Diehl