TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: You see a faster reaction rate when the concentration of reactants is higher.

SOLUTION: What kind of reaction do you see when the concentration of reactants is higher?

PROBLEM: People stopped adding lead to gasoline because of environmental pollution.

SOLUTION: Why did people stop adding lead to gasoline?

PROBLEM: The sun is the largest body in the solar system.

SOLUTION:
What is the largest body in the solar system?