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: Medicine
Incidence of Pneumocystis jiroveci pneumonia has declined in recent times due to which of the following? 
Select and explain. 
A. Better living conditions, B. Decrease in the incidence of HIV infection, C. Use of combination A, D. Stronger immunity of the coho
C: Use of combination A
Answer: C: Use of combination A 
Explanation: Answer- C. Use of combination APneumocystis pneumonia (PCP), once the hallmark of AIDS, has dramatically declined in incidence following the development of effective prophylactic regimens and the widespread use of cA.