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
The gold standards for confirmation of placement of Endotracheal tube is- 
Select and explain. 
A. Capnography, B. Visualization of the chest excursion, C. Auscultation, D. Ultrasound
A: Capnography
Answer: A: Capnography 
Explanation: 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