This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2018, Subject name: Anaesthesia
[{'content': 'All are true regarding Endotracheal intubation except \nSelect and explain. \nA. Saturation not more than 90% after 2 min, B. CO2 in expired air, C. ET inseed under direct vision of glottis, D. Bilateral chest movement', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Endotracheal Tube Intubation:- - When the expiratory gas passes through the tube (hot & humidified) leaves vapour on the tube (tube has gone into trachea)- Tube has Radiopaque blue line on it which can be seen by X-ray- Earlier 90% saturation,if it continuously stas dropping suspects that tube is not in the Respiratory tract- Best way for confirmation - Capnography', 'role': 'assistant'}]