This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
[{'content': 'Extent of esophagus is \nSelect and explain. \nA. C3 - C6, B. C6 - T11, C. T10 - T12, D. C3 - T6', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The esophagus has cervical, thoracic, and abdominal pas, extending from the lower end of the pharynx (C6 veebrae) to the cardiac opening of the stomach (T11 or 12 veebral level). It is about 25 to 30 cm long', 'role': 'assistant'}]