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
In cell membrane, on the basis of mass, proteins and lipids are present at a ratio of 
Select and explain. 
A. 1:02, B. 1:01, C. 2:01, D. 4:01
B: 1:01
Answer: B: 1:01 
Explanation: According to 'Principles of Medical Physiology', "The cell membrane contains proteins and lipids in 50:50 ratios. This refers to the ratio of their masses and not numbers".