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': 'A girl about to marry has comedonal acne. Drug to treat such a case is: March 2013 \nSelect and explain. \nA. Topical antibiotic, B. Benzoyl peroxide, C. Retinoids, D. Estrogen', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C i.e. RetinoidsRetinoids are mainly comedolyticAcneComedones are characteristic of: Acne vulgarisComedones are:- Small cysts,- formed in hair follicles,- due to blockage of the follicular orifice- by the retention of sebum and keratinous materialAcen vulgaris is caused by: Obstruction of pilosebaceous duct Nodulocystic acne (NA)Treatment of NA: Isotretinonin (synthetic retinoic acid)', 'role': 'assistant'}]