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
[{'content': "All of the following transport processes follow 'saturation kinetics' except \nSelect and explain. \nA. Facilitated diffusion, B. Na+  - Ca2+ exchanger, C. Simple diffusion, D. Na+ coupled active transport", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Saturation kinetics is seen in transport mechanisms that utilize carrier proteins. In passive transport mechanisms, there is no carrier protein.', 'role': 'assistant'}]