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 compares the intensity of bone-conducted tuning fork sound without and with raising pressure on the tympanic membrane with Siegel&;s speculum. It&;s a test of bone conduction and examines the effect of increased air pressure in ear canal on the hearing. (Ref: Diseases of EAR, NOSE and THROAT by PL DHINGRA; 6TH Edition; Page no 22,447)