<prompt> Which of the following are used to protect airways -a LMAb Endotracheal tube c Ryles tube d Combitubee Sengsten blackmore tubeadabcbdbcd  <response>: First you should know the meaning of airway protection.Airway protection means protecting the lower airways against aspiration of regurgitated gastric contents.Endotracheal intubation is the best mean to protect airways. Tubes used for endotracheal intubation are :-Standard endotracheal tube RAE preformed tubes Spiral embedded flexometallic armored tubeMicrolagngeal laryngotracheal surgery tubeColees tube endotrol tubeDouble lumen tubeAbout LMAThe classic LMA should not be regarded as providing any protection against aspiration of regurgitated gastric contents and is contraindicated for patients who are not starved or who may have a full stomach.Core topics in airway managementHowever, if LMA uses devices with an additional esophageal drainage lumen, it can be used in patients with an increased risk of aspiration. Such devices are combitube, Easytube, and intubating LMA fastrach. 