This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
Myelin contains protein to lipid ratio as 
Select and explain. 
A. 1:01, B. 2:01, C. 3:01, D. 1:04
D: 1:04
Answer: D: 1:04 
Explanation: None