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': 'Which antibiotic acts by inhibiting protein synthesis - \nSelect and explain. \nA. Cefotetan, B. Doxycycline, C. Ciprofloxacin, D. Oxacillin', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Doxycycline", 'role': 'assistant'}]