This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Human identification, Subject name: Forensic Medicine
Permanent impairment of fingerprints occurs in all except 
Select and explain. 
A. Leprosy, B. Acanthosis nigricans, C. Electrical injuries, D. Radiation injuries
B: Acanthosis nigricans
Answer: B: Acanthosis nigricans 
Explanation: Permanent impairment of fingerprints occurs in: Leprosy Electrical injuries Radiation injuries Ridge alteration occur in: Acanthosis nigricans Scleroderma