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': 'Which of the following is/are not the cause of hypopigmentation: \nSelect and explain. \nA. Leprosy, B. Pinta, C. Syphilis, D. None', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. None', 'role': 'assistant'}]