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:
why is the congo river not navigable for its entire course

Ex Output:
the three major falls


Ex Input:
where does the phosphorus found in living things originate

Ex Output:
rocks


Ex Input:
where is the nile river located in the world

Ex Output:

northeastern Africa