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
[{'content': 'Most permeable to pure phospholipid bilayer:- \nSelect and explain. \nA. O2, B. Na+, C. H2O, D. Cl-', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]