TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: A penguin must do increase muscle mass before molting.

SOLUTION: A penguin must do what before molting?

PROBLEM: Compounds with metals and nonmetals sharing electrons are known as ions kinds of compounds.

SOLUTION: Compounds with metals and nonmetals sharing electrons are known as what kinds of compounds?

PROBLEM: Coronary artery disease is the leading cause of death worldwide.

SOLUTION:
What is the leading cause of death worldwide?