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
Middle ear infections are known to spread to the brain from all of the following routes, except - 
Select and explain. 
A. Direct Bony Invasion, B. Oval / Round window, C. Hematogenous spread, D. Lymphatic spread
D: Lymphatic spread
Answer: D: Lymphatic spread 
Explanation: None