<prompt> Combination of trimethoprim and sulfamethoxazole is effective against which opportunistic infection in AIDS:Herpes simplexCryptococcal meningitisPneumocystis jiroveciTuberculosis  <response>: 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. 