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: Pharmacology
Drug of choice in pneumonia caused by P. carinii is : 
Select and explain. 
A. Penicillin, B. Cotrimoxazole, C. Kanamycin, D. Levofloxacin
B: Cotrimoxazole
Answer: B: Cotrimoxazole 
Explanation: None