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
For how long should NiTi files be submerged in NaOCl at 122-degree F to prevent damage to file corrosion 
Select and explain. 
A. 20 mins, B. 45 mins, C. 60 mins, D. 2 hours
C: 60 mins
Answer: C: 60 mins 
Explanation: Direct lines from book "warming of NaOCI to 122° F (50' C) leads to increase in collagen dissolution as potential to disinfecting, but it can leads to detrimental corrosion effects on NiTi instruments immersion for 1 hr".