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
Passive transfer of solvent occurs in: 
Select and explain. 
A. Osmosis, B. Diffusion, C. Pinocytosis, D. All of the above
A: Osmosis
Answer: A: Osmosis 
Explanation: The diffusion of solvent molecules into a region in which there is a higher concentration of a solute to which the membrane is impermeable--is called osmosis Diffusion: net flux of solute paicles from areas of high concentration to areas of low concentration. Pinocytosis is an active process (cell drinking)