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: ENT
[{'content': 'Middle ear infections are known to spread to the brain from all of the following routes, except - \nSelect and explain. \nA. Direct Bony Invasion, B. Oval / Round window, C. Hematogenous spread, D. Lymphatic spread', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]