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

Example Input: Passage: They will all blend together. The dyes will move through the water until an even distribution is achieved. The process of moving from areas of high amounts to areas of low amounts is called diffusion. Answer: diffusion
Example Output: The process of moving from areas of high amounts to areas of low amounts is called what?

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

Example Input: Passage: In many ways, humans are unique among mammals. For example, we have bigger brains and a greater ability to learn than any other species in the mammalian class. In many ways, however, we are typical of the mammalian order to which we belong. That order is the Primate Order. To fully understand what it means to be human, you need to know more about this fascinating order of mammals. Answer: humans
Example Output:
What mammalian class has the greatest ability to learn?