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: Social & Preventive Medicine
[{'content': 'In CSSM programme drug of choice for Pneumonia: \nSelect and explain. \nA. Chloramphenicol, B. Doxycycline, C. Erythromycin, D. Co-trimoxazole', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]