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: Medicine
[{'content': 'Which of the following condition is not known to cause diabetes insipidus? \nSelect and explain. \nA. Head injury, B. Histiocytosis, C. Multiple sclerosis, D. Viral encephalitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Multiple sclerosis', 'role': 'assistant'}]