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: Pathology
[{'content': 'Which statement about the esophagus is TRUE? Select all that apply \nSelect and explain. \nA. It is a cartilaginous tube, B. It extends from the nasal cavity to the stomach., C. It lies anterior to the trachea, D. It has upper and lower sphincters', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D:\xa0Upper and lower esophageal sphincters, located at the upper and lower ends of the esophagus, respectively, regulate the movement of food into and out of the esophagus.\nA:\xa0The esophagus is a muscular tube, lined with moist stratified squamous epithelium.\nB:\xa0It extends from the pharynx to the stomach. It is about 25 centimeters (cm) long.\nC:\xa0It lies anterior to the vertebrae and posterior to the\xa0trachea\xa0within the mediastinum.', 'role': 'assistant'}]