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: Dental
[{'content': 'True about vitiligo are all except – \nSelect and explain. \nA. Genetic predisposition is known, B. Leucotrichia is associated with good prognosis, C. PUVA is used for treatment, D. Topical steroids give good results', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Leucotrichia (depigmented hair) is a poor prognostic factor.', 'role': 'assistant'}]