This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of skin, Subject name: Dental
[{'content': 'Comedones are seen in- \nSelect and explain. \nA. Acne vulgaris, B. Lichen Planus, C. Adenoma sebaceum, D. Pityriasis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Acne causes polymorphous cutaneous lesions such as comedones, papules, pustules, pseudocysts and abscesses which may leave scarring.comedones are the characteristic of acne vulgaris. Reference Harrison20th edition pg 1204', 'role': 'assistant'}]