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\*.

Example Input: why is the congo river not navigable for its entire course
Example Output: the three major falls

Example Input: who plays jacob black's father in twilight
Example Output: Gil Birmingham

Example Input: who was the overall british commander of the gallipoli campaign
Example Output:
Roger Keyes