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
True about vitiligo are all except – 
Select and explain. 
A. Genetic predisposition is known, B. Leucotrichia is associated with good prognosis, C. PUVA is used for treatment, D. Topical steroids give good results
B: Leucotrichia is associated with good prognosis
Answer: B: Leucotrichia is associated with good prognosis 
Explanation: Leucotrichia (depigmented hair) is a poor prognostic factor.