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
Most common agent causing tuberculosis in AIDS patient in tropical countries is - 
Select and explain. 
A. Mycobacterium tuberculosis, B. Mycobacterium intracellulare, C. Mycobacterium parvum, D. Mycobacterium atypical
A: Mycobacterium tuberculosis
Answer: A: Mycobacterium tuberculosis 
Explanation: None