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': 'Peibaldism refers to \nSelect and explain. \nA. Androgenic alopecia, B. Erythema nodusum leprosum, C. Associated with white forelock, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Piebaldism is an uncommon congenital autosomal dominant, stable patterned leukoderma characterized by a frontal, median or paramedian depigmented patch with a white forelock. There are also macules with scattered hyperpigmented islets. Mutations in the KIT gene on chromosome 14 are the cause. A white forelock on a white triangular elongated or diamond- shaped macule on the forehead from bih is the classical feature in 80%-90%of cases. It is due to defect in migration of melanoblasts from neural crest to skin and hair follicles. melanocytes and melanin are absent at the site of lesions IADVL textbook of dermatology , pigmentary disorders , page 743', 'role': 'assistant'}]