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: Dental
[{'content': 'Pulse oximetry is used in: \nSelect and explain. \nA. Blood volume, B. Blood coefficient, C. Laser wavelength for estimation of blood flow, D. Probe with diode is used to measure oxygen saturation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Pulse Oximetry is a non-invasive method to measure the oxygen saturation levels during the administration of anesthesia or other medications with the help of a finger, ear, or foot probes.\nThe pulse oximeter sensor consists of two light-emitting diodes, one to transmit red light (660 nm) and the other to transmit infrared light (940 nm), and a photodetector on the opposite side of the vascular bed.\xa0\nThe light-emitting diode transmits red and infrared light through a vascular bed such as the finger or ear.\n\nRef: Grossman’s endodontics, 13th edition, pg no:76', 'role': 'assistant'}]