<prompt> Eustachian tube patency seen by -ValsalvaMethylene blue testToyn bee testAll the above  <response>: Ans. is d i.e., All the above Tests for Eustachian tube patencyValsalva testo Politzer testo Catheterizationo Methylene blue testo Toynbee testo Inflation-Deflation testo Sonotubometryo Frenzel maneuver 