This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Antimetabolites and Quinolones, Subject name: Pharmacology
Drug of choice for treatment of Pneumocystitis jiroveci pneumonia is 
Select and explain. 
A. Cotrimoxazole, B. Amoxicillin, C. Dexamethasone, D. Ceftriaxone
A: Cotrimoxazole
Answer: A: Cotrimoxazole 
Explanation: DOC for both prophylaxis and treatment of Pneumocystis jiroveci pneumonia is Cotrimoxazole Other drugs that can be used are Dapsone Clindamycin Pentamidine Atovaquone