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
Treatment of acne- 
Select and explain. 
A. 13 cis retionol, B. Minocycline/Tetracycline, C. Erytromycin, D. All
D: All
Answer: D: All 
Explanation: A i.e. 13 cis retionol; B i.e. Minocycline; C i.e. Erytromycin