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\*.

[Q]: why is the congo river not navigable for its entire course
[A]: the three major falls


[Q]: where would the smallest particles on a beach be found (site 3)
[A]: behind the beach


[Q]: who sings the theme song for that 70's show
[A]:
Todd Griffin