This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Leprosy, HIV & STDs, Subject name: Social & Preventive Medicine
Most common oppounistic infection in AIDS worldwide is:- 
Select and explain. 
A. Tuberculosis, B. Candida, C. Histoplasmosis, D. Pneumocystis carinii pneumonia
D: Pneumocystis carinii pneumonia
Answer: D: Pneumocystis carinii pneumonia 
Explanation: AIDS:- - Caused by HIV . - Mode of transmission - Sexual, blood, needle/syringes, veical. - Prevalence - 0.22%. - MC age group affected - 30-44yrs. - MC oppounistic infection in AIDS:- World : Pneumocystis carinii pneumonia. India: Tuberculosis.