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': 'Causes of localized hypopigmented macule or patch are all except ? \nSelect and explain. \nA. Vitiligo, B. Piebaldism, C. Pityriasis alba, D. Freckle', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Freckle", 'role': 'assistant'}]