This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cell Membrane and transpo protiens, Subject name: Physiology
The X-linked Charcot-Marie-Tooth disease results from a defect of: 
Select and explain. 
A. Connexin 30, B. Connexin 32, C. Connexin 36, D. Connexin 40
B: Connexin 32
Answer: B: Connexin 32 
Explanation: Charcot Marie Tooth disease is a peripheral neuropathy. It results from defective connexin-32 that forms gap junctions between adjacent Schwann cells. Defect in connexin 40 - Idiopathic atrial fibrillation.