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
Following are the laboratory tests for the diagnosis of vestibular dysfunction except ? 
Select and explain. 
A. Electronystagmography, B. Optokinetic test, C. Galvanic test, D. Gelle's test
D: Gelle's test
Answer: D: Gelle's test 
Explanation: Ans. is 'd' i.e., Gelle's test Vestibular system The vestibular system contributes to balance and to the sense of spatial orientation. It is a sensory system that provides the leading contribution about movement and sense of balance. It includes the labyrinth (semicircular canals and otolith : utricle & sacules) of the inner ear and is situated in the vestibulum in the inner ear. The symptoms of vestibular dysfunction are veigo, dizziness and Unbalance.