This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'All of the following are true about connexons, EXCEPT: \nSelect and explain. \nA. It is a protein, B. Has five subunits, C. Gap junction unit, D. Charcot marie tooth disease', 'role': 'user'}, {'content': "Answer: B \nExplanation: Connexons is an assembly of six proteins called connexins. It is a unit of gap junction, helps substances to pass between cells without entering the extracellular fluid. Charcot marie tooth disease, its X linked form is said to be linked to mutant connexons. Ref: Ganong's Review of Medical Physiology, 21st Edition, Page 17", 'role': 'assistant'}]