This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Channelopathies and Neuropathies, Subject name: Medicine
Small fiber neuropathy is seen in? 
Select and explain. 
A. HIV, B. Vitamin B12 deficiency, C. AIP, D. Cisplatin toxicity
A: HIV
Answer: A: HIV 
Explanation: Small unmyelinated peripheral nerve fibers, Categorized as C fibers, In skin and organs. Innervate the skin (somatic fibers) , Help to control autonomic function. Causes of Small Fiber Neuropathy: 1. Diabetes mellitus 2. Leprosy 3. Amyloidosis 4. Tangier's disease 5. Sjogren syndrome 6. HIV 7. Sarcoidosis