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.
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Question: Who wrote i look to you by whitney houston?

Answer: Robert Sylvester Kelly


Question: When does arrow season 6 air on tv?

Answer: October 12, 2017


Question: The nation that joined germany and austria-hungary after world war i began was?

Answer:
Ottoman Empire and Bulgaria