<prompt> Vestibular function is tested by -a Galvanic stimulation testb Acoustic reflexc Fistula testd Impedance audiometrye Cold caloric testacdbdecdeace  <response>: Clinical testsFistula testQRomberg testGaitPast-pointing and fallingQHallpike maneuver positional testLab testCaloric test Modified Kobraks test Fitzgerald-Hallpike test Bithermal caloric test Cold-air caloric test by Dundas-Grant method. Done in case of perforation of tympanic membrane.ElectronystagmographyOptokinetic testRotation testGalvanic testQPosturography 