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': 'False about blood brain barrier is \nSelect and explain. \nA. There are gaps between tight junctions at the active sites, B. There are no gaps between active sites, C. Less activity in the membrane, D. Fibronectin provides a barrier for diffusion', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]