This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Headache And Migraine, Subject name: Medicine
[{'content': 'All of the following cause metabolic headache except: \nSelect and explain. \nA. Hypoxia, B. Hypercapnia, C. Hyperglycemia, D. Hyponatremia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hypoxia Causes cerebral vasodilation --> headache. Hyperglycemia Hyperglycemia does not present as headache Hypercapnia Cause cerebral vasodilation and stretching of meninges. Hyponatremia Cerebral edema leads to a headache and seizures.', 'role': 'assistant'}]