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': 'Which of he following  devices doesn’t use the principle of fluorescence in diagnosis of caries \nSelect and explain. \nA. Diagnodent, B. QLF, C. FOTI, D. Soprolife', 'role': 'user'}, {'content': 'Answer: C \nExplanation: DIAGNOdent is an instrument designed to facilitate the detection\xa0 and\xa0 quantification\xa0 of\xa0 dental\xa0 caries\xa0 on\xa0 occlusal and smooth surfaces (Kaltenbach & Voigt GmbH & Co., Biberach/Riss,\xa0 Germany). It\xa0 uses\xa0 a\xa0 diode\xa0 laser light source and a fibreoptic cable that transmits the light to a handheld probe with a fibreoptic eye in the tip. The light is absorbed and induces infrared fluorescence by organic and inorganic material. The emitted fluorescence is collected\xa0 at the probe tip, transmitted through\xa0 ascending\xa0 fibres,\xa0 and\xa0 processed\xa0 and\xa0 presented on a display window as an integer between 0 and 99. Increased\xa0 fluorescence\xa0 reflects\xa0 potential\xa0 caries-affected tooth substance. The identity of the material responsible that DIAGNOdent is capable of detecting relatively advanced caries lesions, and DIAGNOdent readings show a very good correlation with histologic evidence of caries, but not with the depths of the lesions in dentin.\nConventional clinical caries examinations routinely use transillumination to identify lesions located on the interproximal surfaces of the anterior teeth. For at least\xa0 30 years a fibreoptic transillumination (FOTI) instrument has been available for clinical use. It provides an intense light beam that is transmitted through a fibreoptic cable to a specially designed probe to permit the use of transillumination on the proximal surfaces of posterior teeth, Repeated improvements have been made in the instrument so that it may be used on occlusal and proximal tooth surfaces and the instrument is commonly used, often in place of radiographs, in private practices in Europe.', 'role': 'assistant'}]