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: Anatomy
[{'content': 'The rate of formation of CSF per day: \nSelect and explain. \nA. 1000 c.c., B. 2000 c.c., C. 5000 c.c., D. 8000 c.c.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 5000 c.c.', 'role': 'assistant'}]