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: Medicine
[{'content': 'Mid esophageal diveicula is classically caused by: \nSelect and explain. \nA. Congenetal defect, B. Esophageal squamous cell carcinoma, C. Tuberculosis, D. Trauma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Mid-esophageal diveicula caused by traction from adjacent inflammation classically tuberculosis. They are true diveicula involving all layers of the esophageal wall. Reference: Harrisons Principles of Internal Medicine, 18th Edition', 'role': 'assistant'}]