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 won season 10 america's got talent?
Paul Zerdin

Dont come around here no more video director?
Jeff Stein

What authentication scheme is being used with radius?

Challenge-Handshake Authentication Protocol