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 Input:
western movie with dean martin and frank sinatra

Ex Output:
4 for Texas


Ex Input:
what is the microscopic unit of the kidney

Ex Output:
The nephron


Ex Input:
what does barium do in a ct scan

Ex Output:

improve visualization