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

Prostate is the most common type of cancer in adult males.
What is the most common type of cancer in adult males?

Light retains its original color under water because frequency remains the same when light is refracted.
Light retains its original color under water because what remains the same when light is refracted?

Bees are naturalized on every continent except antarctica.

Bees are naturalized on every continent except which?