<prompt> Bitherinal caloric test tests:Anterior semicircular canalHorizontal semicircular canalSuperior semicircular canalPosterior semicircular canal  <response>: In Fitzgerald-Hallpike test bithermal caloric test, patient lies supine with head tilted 30deg forward so that horizontal canal is veical. Ears are irrigated for 40 seconds alternatively with water at 30degC and at 44deg C 70 below above normal temperature observed for appearance of nystagmus till its end point 