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': "All of the following transpo processes follow 'saturation kinetics' except: \nSelect and explain. \nA. Facilitated diffusion, B. Na+- Ca2+exchanger, C. Simple diffusion, D. Na+- coupled active transpo", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Simple diffusion occurs by viue of kinetic energy of the paicles. Thus, it will never stop, except at absolute zero temperature; neither will it show any saturation kinetics. Saturation kinetics are exhibited by those transpos which are mediated by carriers. Carriers have finite number of binding sites, to bind and transpo a substance. When all the binding sites are occupied, the carrier is said to be "saturated". Options A, B, and D are carrier mediated transpos.', 'role': 'assistant'}]