This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Dental
A lady came with unilateral white skin lesions with leukotrichia. Shows 2 white spots 1 x 1cm each over left side of chin and neck. Diagnosis? 
Select and explain. 
A. Segmental vitiligo, B. Piebaldism, C. Waardenburg's syndrome, D. Regional vitiligo
A: Segmental vitiligo
Answer: A: Segmental vitiligo 
Explanation: .