instruction:
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\*.
question:
who do the avengers fight in infinity war
answer:
Thanos


question:
actress who played emily walters in the recent movie hampstead
answer:
Diane Keaton


question:
critical angle of an interface between a dense medium and air
answer:

angle of incidence