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
In a patch of vitiligo 
Select and explain. 
A. Melanosomes are absent, B. Melanin synthesis is inhibited, C. Melanocytes are reduced, D. Melanocytes are absent
D: Melanocytes are absent
Answer: D: Melanocytes are absent 
Explanation: 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