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

Input: Consider Input: Proteins are long chains of amino acids.

Output: What are long chains of amino acids?


Input: Consider Input: 40 m/s north of the following represents the velocity of a moving object.

Output: Which of the following represents the velocity of a moving object?


Input: Consider Input: Lipids play several important roles in the human body.
Output: What play several important roles in the human body?