This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: dermatology and infectious disease, Subject name: Pathology
Reactivation tuberculosis is almost excusively a disease of the 
Select and explain. 
A. Lungs, B. Bones, C. Joints, D. Brain
A: Lungs
Answer: A: Lungs 
Explanation: Persons who are previously exposed to tuberculous infection shows incidence of reactivation of primary tuberculosis and the pattern of lesions in such cases is similar to that of primary tuberculosis i.e. with involvement of hilar lymph nodes rather than cavitary and apical lesions in the lung. In addition, infection with M. avium-intracellulare occurs more frequently in cases of AIDS Ref: Textbook of pathology (harsh mohan)6th edition, page no.153