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: Pathology
[{'content': 'Feature of acanthosis nigricans is \nSelect and explain. \nA. Insulinoma, obesity & cutaneous hypopigmentation, B. Insulin resistance, obesity, cutaneous hyperpigmentation, C. Thickening of spinous Layer, insulin resistance, obesity, D. Thickening of spinous layer, insulin resistance, lean', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]