This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Pharmacology
The combination of trimethoprima dn sulfamethoxazole is effective against which of the following oppounistic infections in the AIDS patient? 
Select and explain. 
A. Disseminated Herpes simplex, B. Cryptococcal meningitis, C. Pneumocystis jiroveci, D. Tuberculosis
C: Pneumocystis jiroveci
Answer: C: Pneumocystis jiroveci 
Explanation: (Ref: KDT 6/e p686, 687) Cotrimoxazole is effective against Pneumocystis and toxoplasmosis.