This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection, Subject name: Pediatrics
What wavelength is used in the given instrument to treat any pathology in new born? 
Select and explain. 
A. 360 nm, B. 470 nm, C. 540 nm, D. 230 nm
B: 470 nm
Answer: B: 470 nm 
Explanation: Ans. B. 470nmAbove image is phototherapy unit machine used to treat jaundice in newborn. Wavelength which is most effective in treating this is 470-490nm