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\*.

Input: Consider Input: who do the avengers fight in infinity war

Output: Thanos


Input: Consider Input: where was the first motte and bailey castle built

Output: northern Europe


Input: Consider Input: name the ruler of russia during first world war


Output: Nicholas II