This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
[{'content': 'CSF is formed by - \nSelect and explain. \nA. Arachnoid villi, B. Venous plexus, C. Choroid plexus, D. Subfornical nucleus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Choroid plexus(Ref: Ganong, 25th ed/p.603)CSF is produced from choroid plexuses epithelial cells. It is absorbed through the arachnoid villi into veins', 'role': 'assistant'}]