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
[{'content': 'Protein to lipid ratio is LEAST in: \nSelect and explain. \nA. Inner mitochondrial membrane, B. Outer mitochondrial membrane, C. RBC membrane, D. Myelin sheath', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Myelin sheath has the least Protein:Lipid Ratio Membrane Protein Lipid Carbohydrate Red blood cell membrane 49% 43% 8% Myelin around nerve cells 18% 79% 3% Inner mitochondrial membrane 76% 24% 0%', 'role': 'assistant'}]