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': 'Which of the following statements about facilitated diffusion is true \nSelect and explain. \nA. It is a form of active transport, B. It requires a carrier protein, C. Rate of transport is proportionate to the concentration gradient, D. Requires creatine phosphate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Facilitated diffusion is a form of passive transport which occurs along the concentration gradient, but requires a carrier protein.', 'role': 'assistant'}]