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
[{'content': 'The drug of choice for thoracic actinomycosis is- \nSelect and explain. \nA. Amphotericin - B, B. Penicillin, C. Cotrimoxazole, D. Itraconazole', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Penicillin Penicillin is the drug of choice for all types of actinomycosis.", 'role': 'assistant'}]