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
[{'content': 'During regulatory volume decrease, many cells will increase \nSelect and explain. \nA. Their volume, B. Influx of Na+, C. Efflux of K+, D. Synthesis of sorbitol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: K+ is the major intracellular ion; efflux of K+ will produce an osmotic flow of water out of the cell. Water exit will lead to a decrease in cell volume.An influx of Na+ and synthesis of sorbitol do not occur during this process because both processes would increase intracellular osmolytes and drive water into the cell, increasing cell volume.Ref: Guyton; 13th edition', 'role': 'assistant'}]