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: Pathology
Child belongs toBihar Shows hypopigmented patches over his face. What is the right diagnosis? 
Select and explain. 
A. P. alba, B. Leprosy, C. Vitilgo, D. None
B: Leprosy
Answer: B: Leprosy 
Explanation: As the child belongs to an endemic area, So our answer is inclined for Leprosy. The disease is clinically characterized by one or more of the three cardinal signs: hypopigmented or erythematous skin patches with definite loss of sensation, thickened peripheral nerves, and acid-fast bacilli detected on skin smears or biopsy material. Ref Robbins 9/e pg 234