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
All of the following are disorders of hypopigmentation except: 
Select and explain. 
A. Albinism, B. Piebaldism, C. Nevus of Ota, D. Nevus achromicus
C: Nevus of Ota
Answer: C: Nevus of Ota 
Explanation: Nevus of Ota is characterized by hyperpigmented patches over the distribution of ophthalmic and maxillary divisions of trigeminal nerve.