This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Skin
[{'content': 'Difference in acne rosacea & acne vulgaris: \nSelect and explain. \nA. Erythema, B. Absence of comedone, C. Papule, D. Pustule', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Absence of comedoneComedones are characteristic lesions of acne, absent in rosacea', 'role': 'assistant'}]