TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Group 16 is called the oxygen group.

SOLUTION: Group 16 is called what?

PROBLEM: All cells have the small size in common.

SOLUTION: What do all cells have in common?

PROBLEM: If a catalyst runs out, the reaction slows.

SOLUTION:
What happens if a catalyst runs out?