TASK DEFINITION: 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\*.
PROBLEM: who is the president of the united states 2016

SOLUTION: Barack Obama

PROBLEM: when did the last harry potter movie cone out

SOLUTION: 2011

PROBLEM: what war broke out after texas became the 28th state

SOLUTION:
the Mexican–American War