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 oppounistic infection in HIV, globally ? 
Select and explain. 
A. P. jiroveci, B. Candida, C. M. tuberculosis, D. Cryptococcus
A: P. jiroveci
Answer: A: P. jiroveci 
Explanation: Ans. is 'a' i.e., P. jiroveci R jiroveci (Carinii) is the most common oppounistic infection in AIDS patients, overall. "P jiroveci pneumonia remains the most common AIDS related oppounistic infection" - Textbook of diagnostic microbiology o In developing countries (like India), most common oppounistic infection in AIDS is M. tuberculosis.