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
What is the indication of using Micro Wick and Microcatheter sustained release devices? 
Select and explain. 
A. Drooling of saliva, B. Frey's syndrome, C. Conrol of epistaxis, D. Deliver drug to the round membrane
D: Deliver drug to the round membrane
Answer: D: Deliver drug to the round membrane 
Explanation: Micro Wick and Microcatheter are methods of delivery of medications directly to the inner ear.