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
Infection of CNS spreads to the inner ear through 
Select and explain. 
A. Cochlear aqueduct, B. Endolymphatic sac, C. Vestibular aqueduct, D. Hyrtl's fissure
A: Cochlear aqueduct
Answer: A: Cochlear aqueduct 
Explanation: The scale tympani is closed by a secondary tympanic membrane. It is also connected with subarachnoid space through aqueduct of the cochlea