This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anaesthesia
[{'content': 'Which of the following are used to protect airways -\na) LMA\nb) Endotracheal tube \nc) Ryles tube \nd) Combitube\ne) Sengsten blackmore tube \nSelect and explain. \nA. ad, B. abc, C. bd, D. bcd', 'role': 'user'}, {'content': 'Answer: C \nExplanation: First you should know the meaning of airway protection.\nAirway protection means protecting the lower airways against aspiration of regurgitated gastric contents.\nEndotracheal intubation is the best mean to protect airways. Tubes used for endotracheal intubation are\xa0:-\nStandard endotracheal tube\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\nRAE preformed tubes\xa0\nSpiral embedded (flexometallic armored tube)\nMicrolagngeal & laryngotracheal surgery tube\nColees tube & endotrol tube\nDouble lumen tube\nAbout LMA\n\n"The classic LMA should not be regarded as providing any protection against aspiration of regurgitated gastric\xa0contents and is contraindicated for patients who are not starved or who may have a full stomach".\n—Core topics in airway management\n\nHowever, 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\xa0combitube, Easytube,\xa0and\xa0intubating\xa0LMA\xa0(fastrach).', 'role': 'assistant'}]