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

Example Input: Passage: The body of a cnidarian consists of two cell layers, ectoderm and endoderm. The cells surround a digestive cavity called the coelenteron (see Figure below ). Cnidarians have a simple digestive system. The single opening is surrounded by tentacles, which are used to capture prey. The tentacles are covered with nematocyst cells. Digestion takes place in the coelenteron. Nutrients are absorbed and gases exchanged through the cells lining this cavity. Fluid in the coelenteron creates a hydrostatic skeleton. Answer: tentacles
Example Output: Cnidarians have a simple digestive system with a single opening surrounded by what type of structures, which are used to capture prey?

Example Input: Passage: Insight learning , which is based on past experience and reasoning, is a hallmark of the human animal. Humans have used insight learning to solve problems ranging from starting a fire to traveling to the moon. It usually involves coming up with new ways to solve problems. Insight learning generally happens quickly. An animal has a sudden flash of insight. Insight learning requires relatively great intelligence. Human beings use insight learning more than any other species. They have used their intelligence to solve problems ranging from inventing the wheel to flying rockets into space. Answer: insight
Example Output: What type of learning is based on past experience and reasoning?

Example Input: Passage: Non-polar molecules can interact by way of London dispersion forces. Answer: london dispersion
Example Output:
What type of force allows non-polar molecules to interact?