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': 'Acanthosis nigricans can occur due to - \nSelect and explain. \nA. Increased multiplication of basal cells, B. Cornification of basal cells, C. Keratinisation of epidermal cells, D. All', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hyperplasia of stratum spinosum of the epidermis.\nHyperkeratosis → Thickening of Stratum corneum of epidermis (Cornification of epidermis).\nSlight basal cell hyperpigmentation.', 'role': 'assistant'}]