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
A case of bell's palsy on steroids, shows no improvement after two weeks. Next step in manangement is: 
Select and explain. 
A. Vasodilators and ACTH, B. Physiotherapy, C. Steroids dose, D. Electrophysiological Nerve testing
D: Electrophysiological Nerve testing
Answer: D: Electrophysiological Nerve testing 
Explanation: None