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

Example Input: Passage: Images in a plane mirror are reversed left and right but not reversed top and bottom. Answer: plane mirror
Example Output: Images in what type of mirror are reversed left and right but not reversed top and bottom?

Example Input: Passage: Saturated fatty acids have only single bonds between carbon atoms. As a result, the carbon atoms are bonded to as many hydrogen atoms as possible. In other words, the carbon atoms are saturated with hydrogens. Saturated fatty acids are found in fats. Answer: saturated
Example Output: Carbon atoms are bonded to as many hydrogen atoms as possible in what type of fatty acids?

Example Input: Passage: Cellulose is a compound found in plants. The chief component of cellulose is carbon. Cellulose is one of many carbon-based compounds that make up living things. In fact, carbon-based compounds are the most common type of compound on Earth. More than 90 percent of all known compounds contain carbon. Do you know why carbon is found in so many compounds? Read on to find out. Answer: carbon-based compounds
Example Output:
What are the most common types of compounds found on earth?