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

Example Input: Passage: Most plant cells have a large central vacuole . It can make up as much as 90 percent of a plant cell's total volume. The central vacuole is like a large storage container. It may store substances such as water, enzymes, and salts. It may have other roles as well. For example, the central vacuole helps stems and leaves hold their shape. It may also contain pigments that give flowers their colors. Answer: vacuole
Example Output: Most plant cells have a large central what?

Example Input: Passage: The angle of reflection equals the angle of incidence. A mirror has a smooth surface and reflects light at specific angles. Light is diffused when it reflects from a rough surface. Mirror images can be photographed and videotaped by instruments. Answer: rough surfaces
Example Output: What kind of surface would cause diffusion when light is reflected off of it?

Example Input: Passage: Deposit feeders, which are organisms that feed on small pieces of organic matter, usually in the top layer of soil. Sea cucumbers are deposit feeders, living on the ocean floor. They eat the tiny scrap particles that are usually abundant in the environments that they inhabit. Answer: deposit feeders
Example Output:
What are are organisms that feed on small pieces of organic matter?