instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Prostate is the most common type of cancer in adult males.
answer:
What is the most common type of cancer in adult males?


question:
Volvox sphere has a distinct front and back end.
answer:
What has a distinct front and back end?


question:
The main advantage of urea is its very low toxicity.
answer:
The main advantage of urea is its very low what?