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: Dental
[{'content': 'All of the following are disorders of hypopigmentation except: \nSelect and explain. \nA. Albinism, B. Piebaldism, C. Nevus of Ota, D. Nevus achromicus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Nevus of Ota is characterized by hyperpigmented patches over the distribution of ophthalmic and maxillary divisions of trigeminal nerve.', 'role': 'assistant'}]