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: Pharmacology
[{'content': 'All of the following are true for post lumbar puncture headache except : \nSelect and explain. \nA. Presents 12 hours after procedure, B. Pain is relieved in standing position, C. Pain is worsened by headshaking, D. Pain is occipitofrontal in location', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]