This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Transpo Processes, Subject name: Physiology
Most permeable to pure phospholipid bilayer:- 
Select and explain. 
A. O2, B. Na+, C. H2O, D. Cl-
A: O2
Answer: A: O2 
Explanation: Movement of hydrophobic molecules/Lipid soluble substances occurs by Simple diffusion Movement of H2O occurs by osmosis Movement of Polar molecules/ions occurs through Channels