In this task, You are given an open-domain question that can be answered based on factual information. Your task is to provide \*short\* answer (in a few words only) for the given question. The short answer can be one or more entities or it can also be boolean \*yes\* or \*no\*.
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Question: who plays sarah on dc legends of tomorrow

Answer: Caity Lotz


Question: who does rachel end up with in friends

Answer: Ross Geller


Question: how old was djokovic when he started playing tennis

Answer:
four