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: Microbiology
[{'content': 'Reactivation of TB is almost exclusively a disease of? \nSelect and explain. \nA. Bone, B. Lymph nodes, C. Lung, D. Brain', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Lung . Post primary (secondary or adult) type of pulmonary tuberculosis is due to - i) Reactivation of latent infection. ii) Exogenous reinfection.", 'role': 'assistant'}]