Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Problem:Passage: The small intestine is a narrow tube that starts at the stomach and ends at the large intestine. In adults, it's about 7 meters (23 feet) long. Most chemical digestion and almost all nutrient absorption take place in the small intestine. Answer: small intestine
Solution:
What is the name of the narrow tube that begins at the stomach and ends at the large intestine?