instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Pleiotropic effects causes symptoms associated with sickle-cell disease.
answer:
What causes symptoms associated with sickle-cell disease?

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

question:
The creation of a voltage across a current-carrying conductor by a magnetic field is known as hall effect.
answer:
The creation of a voltage across a current-carrying conductor by a magnetic field is known as what?