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

[EX Q]: The brain is the most complex organ in the human body.
[EX A]: What is the most complex organ in the human body?

[EX Q]: Volvox sphere has a distinct front and back end.
[EX A]: What has a distinct front and back end?

[EX Q]: Visible light do jellyfish use to startle predators.
[EX A]:
What do jellyfish use to startle predators?