This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skin lesions and disorders of pigmentation, Subject name: Dental
[{'content': 'In a patch of vitiligo \nSelect and explain. \nA. Melanosomes are absent, B. Melanin synthesis is inhibited, C. Melanocytes are reduced, D. Melanocytes are absent', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In a patch of vitiligo, there is a complete loss of melanocytes. In albinism, there is an absence of melanin. IADVL textbook of dermatology , page 754', 'role': 'assistant'}]