instruction:
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.
question:
The strain season 4 episode 10 air date?
answer:
September 17, 2017


question:
When did royal mail and post office split?
answer:
1 April 2012


question:
What type of glacier forms a u shaped valley?
answer:

mountain glaciation