This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Acne and chemical peeling, Subject name: Dental
[{'content': 'Drug of choice for nodulocystic acne is: \nSelect and explain. \nA. Tetracyclines, B. Azithromycin, C. Isotretioin, D. Coicosteroids', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Nodulocystic acne / grade IV acne- DOC- Isotretinoin. Isotretinoin- 13 cis isomer of retinoic acid Dose :0.5-1mg/kg/ k/bwt Max cumulative dose: 120-150mg/kg/bwt', 'role': 'assistant'}]