This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Anatomy
[{'content': 'Treatment of Chlamydia pneumonia is \nSelect and explain. \nA. Erythromycin, B. Ceftriaxone, C. Penicillin, D. Sulphonamide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Although few controlled trials of treatment have been repoed, C. pneumoniae is inhibited in vitro by erythromycin, tetracycline, azithromycin, clarithromycin, gatifloxacin, and gemifloxacin. Recommended therapy consists of 2 g/d of either tetracycline or erythromycin for 10-14 days.. Ref Harrison 19th edition pg 1147', 'role': 'assistant'}]