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

Ex Input:
Passage: The menstrual cycle includes events that take place in the ovary, such as ovulation. Answer: ovary

Ex Output:
Ovulation takes place in what organ and is part of the menstrual cycle?

Ex Input:
Passage: Images in a plane mirror are reversed left and right but not reversed top and bottom. Answer: plane mirror

Ex Output:
Images in what type of mirror are reversed left and right but not reversed top and bottom?

Ex Input:
Passage: Sperm leave the epididymis through the vas deferens. As they travel through the vas deferens, they pass by the prostate and other glands. The sperm mix with secretions from these glands, forming semen. Semen travels through the urethra and leaves the body through the penis. A teaspoon of semen may contain as many as half a billion sperm!. Answer: semen

Ex Output:
What is formed when sperm mixes with secretions from the various other glands of the reproductive system?