This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Airway, Subject name: Anaesthesia
[{'content': 'The gold standards for confirmation of placement of Endotracheal tube is- \nSelect and explain. \nA. Capnography, B. Visualization of the chest excursion, C. Auscultation, D. Ultrasound', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The gold standards for confirmation of placement include Capnography Others method for confirmation of placement of Endotracheal tube Visualization of placement through vocal cords Disposable chemical colorimetric devise', 'role': 'assistant'}]