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 antibiotic tetracycline: \nSelect and explain. \nA. Is bactericidal drug., B. Is a safe drug for administration irrespective of age and sex of the patients., C. Is also administered along with penicillin., D. Is a broad-spectrum antibiotic.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Tetracycline is bacteriostatic and has a broad spectrum of action.', 'role': 'assistant'}]