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: Anaesthesia
[{'content': 'Post Spinal Headache can last for \nSelect and explain. \nA. Upto 10 min, B. Upto 10 hours, C. 7 - 10 days, D. Upto 10 months', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. 7-10 days', 'role': 'assistant'}]