Given a scientific passage and an answer, generate a question for the given answer.

Ex Input:
Passage: Optical telescopes are designed to collect visible light. The two types of optical telescopes are reflecting telescopes and refracting telescopes. Answer: reflecting and refracting

Ex Output:
What are the two types of optical telescopes?

Ex Input:
Passage: Bone marrow is a soft connective tissue that produces blood cells. It is found inside the pores of spongy bone. Answer: bone marrow

Ex Output:
What is found inside the pores of spongy bone?

Ex Input:
Passage: Water also gets colder as you go deeper. The weight of the water pressing down from above increases as well. At great depths, life becomes very difficult. The pressure is so great that only specially adapted creatures can live there. Answer: colder

Ex Output:
Does water get colder or warmer the deeper you go?