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.

Who elects the national people's congress in china?
multi-tiered representative electoral system

Who is the host of khatron ke khiladi 2017?
Rohit Shetty

When did canada withdraw from the kyoto protocol?

December 13, 2011