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

Example Input: Passage: When there is no mass in a volume of space, the space is not curved. An object passing through such space would follow a straight line in our normal way of thinking of a straight line. Answer: curved
Example Output: When there is no mass in a volume of space, the space is not what?

Example Input: Passage: Regulation of transcription in prokaryotes typically involves operons. An operon is a region of DNA that consists of one or more genes that encode the proteins needed for a specific function. The operon also includes a promoter and an operator. The operator is a region of the operon where regulatory proteins bind. It is located near the promoter and helps regulate transcription of the operon genes. Answer: operon
Example Output: Which region of dna consists of one or more genes that encode the proteins needed for a specific function?

Example Input: Passage: The processes of evolution are fundamental to much of biology. Why do people have such a hard time understanding them?. Answer: indoors
Example Output:
Where in relation to the home, are levels of vocs found to be higher?