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\*.

[EX Q]: when did justin bieber perform at madison square garden
[EX A]: August 31, 2010

[EX Q]: when was laika the dog sent into space
[EX A]: 3 November 1957

[EX Q]: the dark part of a shadow where light from a source is completely blocked is called the
[EX A]:
umbra