instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
You call a substance that is not an acid or a base neutral.
answer:
What do you call a substance that is not an acid or a base?

question:
Cancer occurs most often in adults over fifty age.
answer:
Cancer occurs most often in adults over what age?

question:
Bronze is an alloy of copper and tin.
answer:
What is an alloy of copper and tin?