This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (E.N.T.), Subject name: ENT
Hallpike test is done for 
Select and explain. 
A. Vestibular function, B. Corneal test, C. Cochlear function, D. Audiometry
A: Vestibular function
Answer: A: Vestibular function 
Explanation: (A) Vestibular function # FITZGERALD-HALLPIKE TEST (Bithermal Caloric Test):> In this test, patient lies supine with head tilted 30deg forward so that horizontal canal is vertical.> Ears are irrigated for 40 seconds alternately with water at 30degC & at 44deg C & eyes observed for appearance of nystagmus till its end point.> In Fitzgerald-Hallpike test patient lies supine with need tilted 30 degree forward so that horizontal canal is vertical.> Cold water induces nystagmus to opposite side & warm water to the same side (COWS).> By this test we can find canal paresis or dead labyrinth, directional preponderance.