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
Reactivation of TB is almost exclusively a disease of? 
Select and explain. 
A. Bone, B. Lymph nodes, C. Lung, D. Brain
C: Lung
Answer: C: Lung 
Explanation: 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.