This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, 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: Gelle's test is a bone conduction test. It is performed by placing a vibrating fork on the mastoid while changes in air pressure in the ear canal are brought about by siegel's speculum. It is positive in normal person and in those with sensory neural hearing loss. It is negative when ossicular chain is fixed. Ref: Dhingra 7e pg 24.