This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: AIIMS 2018, Subject name: Dental
Which nerve biopsy is taken to diagnose neuritic leprosy? 
Select and explain. 
A. Median nerve, B. Radial cutaneous nerve, C. Ulnar nerve, D. Radial nerve
B: Radial cutaneous nerve
Answer: B: Radial cutaneous nerve 
Explanation: Neuritic leprosy - only nerve involved no skin involvement. - Slit Skin smear(SSS) - negative - Nerve thickening - confirms diagnosis. A purely sensory thickened peripheral nerve should be sampled as there are chances of nerve damage during biopsy If its a motor nerve--> deformity . Therefore, option median & ulnar are ruled out. So Radial cutaneous branch is used for sampling during nerve biopsy.