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

Example Input: Passage: Connective tissue consists of cells that form the body's structure. Examples include bone and cartilage, which protect and support the body. Blood is also a connective tissue. It circulates and connects cells throughout the body. Answer: connective
Example Output: What tissue consists of cells that form the body's structure?

Example Input: Passage: The Sun gives off energy in tiny packets called photons . Photons travel in waves. Figure below models a wave of light. Notice the wavelength in the figure. Waves with shorter wavelengths have more energy. Answer: photons
Example Output: What are the tiny packets of energy the sun gives off called?

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?