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': 'DIAGNOdent, a diagnostic device for assessing the presence or absence of pit and fissure caries. It is a: \nSelect and explain. \nA. Fiberoptic transilluminator, B. Portable digital X-ray device, C. Laser fluorescence device, D. Electronic explorer', 'role': 'user'}, {'content': 'Answer: C \nExplanation: INFRARED LASER FLUORESCENCE (DIAGNOdent)\n\nDIAGNOdent is an instrument designed to facilitate the detection and quantification of dental caries on occlusal and smooth surfaces.\xa0\nIt uses a diode laser light source\xa0and\xa0a\xa0fiberoptic cable that transmits the light to a handheld probe with a fiberoptic eye in the tip.\xa0\nThe light is absorbed and induces infrared fluorescence by organic and inorganic material.\xa0\nThe emitted fluorescence\xa0is\xa0collected\xa0at\xa0the\xa0probe\xa0tip,\xa0transmitted through ascending fibers, and processed and presented on a display window as an integer between 0 and 99.', 'role': 'assistant'}]