This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Dental
[{'content': 'A girl about to marry has comedonal acne. Drug to treat such a case is: \nSelect and explain. \nA. Topical antibiotic, B. Benzoyl peroxide, C. Retinoids, D. Estrogen', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Retinoids are mainly comedolytic Acne Comedones are characteristic of: Acne vulgaris Comedones are: * Small cysts, * formed in hair follicles, * due to blockage of the follicular orifice * by the retention of sebum and keratinous material. Ref : Ref : Thomas b Habif 6th Ed.', 'role': 'assistant'}]