Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Municipal type of pollution comes from sewage, storm drains, septic tanks, boats, and runoff from yards.
What type of pollution comes from sewage, storm drains, septic tanks, boats, and runoff from yards?

The cerebellum of the brain lies under the cerebrum and behind the brain stem.
What part of the brain lies under the cerebrum and behind the brain stem?

Leukocytes blood cells are white.
What color are leukocytes blood cells?