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
Oﬃce personnel who are at higher risk of NO toxicity, to prevent this, the most  sensitive test for nitrous oxide detection is 
Select and explain. 
A. Laminar ﬂow, B. Dosimeter, C. Infrared spectrophotometer, D. High suction speed
C: Infrared spectrophotometer
Answer: C: Infrared spectrophotometer 
Explanation: Periodic (i.e. semi-annual) sampling is done of dental personnel, especially chair-side personnel exposed to nitrous oxide (e.g. with a diffusive sampler, such as a dosimeter or infrared spectrophotometer)
Oﬃce personnel who are at higher risk of NO toxicity, to prevent this most sensitive test for nitrous oxide detection is Infrared spectrophotometer.
Reference: Pediatric Dentistry by Nikhil Marwah 3rd ed, page no 250