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
Which of the following is the most important interaction in the formation of cell membrane lipid bilayer and in lipid-protein interaction? 
Select and explain. 
A. Hydrophobic interactions, B. Both hydrophobic and convalent interactions, C. Covalent bonds, D. Hydrogen bonds
A: Hydrophobic interactions
Answer: A: Hydrophobic interactions 
Explanation: Interactions in the cell membrane.
-        Hydrophobic (most important)–

Between lipids- Information of lipid bilayer​
Transmembrane proteins and lipids

-        Van der walls interaction

Between lipids- Information of lipid bilayer​
Transmembrane proteins and lipids

-        Electrostatic bonds

Between transmembrane and peripheral proteins

-        Hydrogen bonds

Between transmembrane and peripheral proteins

-        Covalent bond (least important)

Peripheral protein with the hydrophilic end of phospholipid