This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pulmonary Tuberculosis and Lung Abscess, Subject name: Pathology
[{'content': 'Reactivated TB is most commonly located near: \nSelect and explain. \nA. Apex, B. Near bronchus, C. Subpleurally, D. Base', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Secondary pulmonary tuberculosis classically involves the apex of the upper lobes of one or both lungs The reason is not known but may relate to high oxygen tension in the apices', 'role': 'assistant'}]