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': "Butchers' was are caused by: \nSelect and explain. \nA. HPV 2, B. HPV 6, C. HPV 27, D. HPV 56", 'role': 'user'}, {'content': "Answer: A \nExplanation: Occupational handlers of meat, poultry or fish have a high incidence of hand was where the skin is in prolonged contact with moist animal flesh. HPV-2 is frequently found in butchers' was, but HPV-7 is present in a third to a half of lesions. Ref: Rook's textbook of dermatology, 8th edition, Pg 33.47", 'role': 'assistant'}]