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': 'The average number of adult female mites on an individual suffering from the common form of scabies is about: \nSelect and explain. \nA. 2, B. 12, C. 16, D. 24', 'role': 'user'}, {'content': "Answer: B \nExplanation: The average number of adult female mites on an individual suffering from the common form of scabies is about 12. Only in crusted (Norwegian) scabies are large numbers of mites present. Ref: Rook's textbook of dermatology, 8th edition Pg 38.37.", 'role': 'assistant'}]