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: Skin
A child presents with white lesion (depigmented macule ) of 2x 2 cm with irregular margin over forehead and glabella. There is white forelock over forehead since birth. Diagnosis is: 
Select and explain. 
A. Piebaldism, B. Dermatitis, C. Vitiligo, D. Nevus of Ito
A: Piebaldism
Answer: A: Piebaldism 
Explanation: Ans. a. PiebaldismWhite forelocks are also seen associated with warden burg syndrome