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.

How many episodes in madam secretary series 4?
22

Which important war conference demanded the unconditional surrender of japan?
Berlin Conference of the Three Heads of Government of the USSR, USA, and UK

When did the real housewives of new york start?

March 4, 2008