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

Example Input: Passage: Infectious diseases are diseases that spread from person to person. They are caused by pathogens such as bacteria, viruses or fungi. What can you do to avoid infectious diseases? Eating right and getting plenty of sleep are a good start. These habits will help keep your immune system healthy. With a healthy immune system, you will be able to fight off many pathogens. The next best way is to avoid pathogens. Though this is difficult, there are steps you can take to limit your exposure to pathogens. Answer: immune system
Example Output: What system is responsible for defending your body against sickness?

Example Input: Passage: Photography by Kat. Ferns are common in the understory of the tropical rainforest . CC BY 2.0. Answer: understory
Example Output: In a tropical rainforest, where are ferns common?

Example Input: Passage: Electromagnetic waves are waves that carry energy through matter or space as vibrating electric and magnetic fields. Electromagnetic waves have a wide range of wavelengths and frequencies. Sunlight contains the complete range of wavelengths of electromagnetic waves, which is called the electromagnetic spectrum. The Figure below shows all the waves in the spectrum. Answer: electromagnetic waves
Example Output:
What type of waves carry energy through matter or space as vibrating electric and magnetic fields?