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
Mid esophageal diveicula is classically caused by: 
Select and explain. 
A. Congenetal defect, B. Esophageal squamous cell carcinoma, C. Tuberculosis, D. Trauma
C: Tuberculosis
Answer: C: Tuberculosis 
Explanation: 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