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': 'The total volume of CSF is : \nSelect and explain. \nA. 50 ml, B. 100m1, C. 150 ml, D. 275 ml', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e 150 ml', 'role': 'assistant'}]