This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
Combination of trimethoprim and sulfamethoxazole is effective against which opportunistic infection in AIDS: 
Select and explain. 
A. Herpes simplex, B. Cryptococcal meningitis, C. Pneumocystis jiroveci, D. Tuberculosis
C: Pneumocystis jiroveci
Answer: C: Pneumocystis jiroveci 
Explanation: Ans. C. Pneumocystis jiroveciThis combination of drug is known as cotrimoxazole. It is bactericidal in nature and plays a synergistic role. It is drug of choice for pneumonia caused by pneumocystis jiroveci in AIDS patients.