Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: The cerebellum is the next largest part of the brain. It lies under the cerebrum and behind the brain stem. The cerebellum controls body position, coordination, and balance. Whether you are riding a bicycle or writing with a pen, you are using your cerebellum. Answer: cerebellum
A:
What part of the brain lies under the cerebrum and behind the brain stem?