This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
The drug used by health workers in the management of acute respiratory infection - 
Select and explain. 
A. Cotrimoxazole, B. Chloramphenicol, C. Benzyl penicillin, D. Gentamycin
A: Cotrimoxazole
Answer: A: Cotrimoxazole 
Explanation: *cotrimoxazole is the drug of choice of treatment of pneumonia *efficacy of cotrimoxazole is to be similiar to ampicillin and procaine penicillin &cure rates are up to 95% *less expensive with little side effects *children with severe pneumonia should be treated with IM benzyl penicillin,ampicillin or chloremphenicol *in very severe pneumonia,chloremphenicol IM is the drug of choice if condition worsens,IM cloxacillin & gentamycin is given