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': 'Which of the following requires a carrier protein? \nSelect and explain. \nA. Exocytosis, B. Facilitated diffusion, C. Simple diffusion, D. Osmosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Facilitated diffusion is the process of spontaneous passive transpo of molecules or ions across a cell&;s membrane specific transmembrane integral proteins.', 'role': 'assistant'}]