This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'Length of esophagus in adults is: \nSelect and explain. \nA. 25 cm, B. 10 cm, C. 15 cm, D. 20 cm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The esophagus is a muscular, collapsible tube about 10 in. (25 cm) long that joins the pharynx to the stomach. The esophagus enters the abdomen through an opening in the right crus of the diaphragm.After a course of about 0.5 in. (1.25 cm), it enters the stomach on its right side.', 'role': 'assistant'}]