Eustachian tube patency seen by -
Valsalva
Methylene blue test
Toyn bee test
All the above
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 Sonotubometry'o Frenzel maneuver