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\*.

who is described as a shrewd and knavish sprite
Puck

who does rachel end up with in friends
Ross Geller

gray matter of the spinal cord is mostly composed of

neuronal cell bodies