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: Skin
[{'content': 'Treatment of acne- \nSelect and explain. \nA. 13 cis retionol, B. Minocycline/Tetracycline, C. Erytromycin, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A i.e. 13 cis retionol; B i.e. Minocycline; C i.e. Erytromycin', 'role': 'assistant'}]