TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Carbon 14 isotope of carbon is typically used to date ancient items.

SOLUTION: What isotope of carbon is typically used to date ancient items?

PROBLEM: Phospholipids are vesicles made of.

SOLUTION: What are vesicles made of?

PROBLEM: Reptiles are a class of tetrapod vertebrates that produce amniotic eggs called.

SOLUTION:
What are a class of tetrapod vertebrates that produce amniotic eggs called?