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: how many seasons of once upon a time is there

SOLUTION: 7

PROBLEM: what are four functions of the cell or plasma membrane

SOLUTION: controls the movement of substances

PROBLEM: how many membranes do gram negative bacteria have

SOLUTION:
two