instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
A penguin must do increase muscle mass before molting.
answer:
A penguin must do what before molting?

question:
Glycerol is a triol, an alcohol which contains three hydroxl functional groups.
answer:
Glycerol is a triol, an alcohol which contains three what?

question:
The unpaired ethmoid bone is located at the midline within the central skull.
answer:
The unpaired ethmoid bone is located where within the central skull?