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: where does the phosphorus found in living things originate

SOLUTION: rocks

PROBLEM: who won the title of world chess championship in 2017

SOLUTION: Armenian grandmaster Levon Aronian

PROBLEM: the members of cabinet under president system are accountable to whom

SOLUTION:
the president