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
Which of the following major minerals is a component of biological membranes? 
Select and explain. 
A. Calcium, B. Sodium, C. Phosphorus, D. Potassium
C: Phosphorus
Answer: C: Phosphorus 
Explanation: The plasma membrane consists of a complex lipid bilayer, phosphate and carbohydrate components, and a large number of proteins embedded in the membrane that connect the inner milieu of the cell with the external environment. .