This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Physiology
[{'content': 'Decreased protein : lipid ratio is seen in: \nSelect and explain. \nA. Inner mitochondrial membrane, B. Outer mitochondrial membrane, C. Sarcoplasmic reticulum, D. Myelin sheath membrane', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Myelin sheath membrane(Ref: Ganong, 25th ed/p.34)Proteins are the major constituents of cell membraneInner mitochondria membrane has maximum protein concentrationThe only exception where lipids outnumber proteins is Myelin sheath of nerve cell membrane', 'role': 'assistant'}]