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
Law of pulse oxymetry is based on 
Select and explain. 
A. Doppler's law, B. Pascal's law, C. Poille's law, D. Beer Lambert's law
D: Beer Lambert's law
Answer: D: Beer Lambert's law 
Explanation: None