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 played boo radley in the movie to kill a mockingbird?

Answer: Robert Selden Duvall


Question: Who was associated with the establishment of the banaras hindu university?

Answer: Madan Mohan Malaviya


Question: How many terminals are there at vienna airport?

Answer:
4