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
Thermafil GP is sterilized by: 
Select and explain. 
A. 5.25%  NaOCl for 1 min. then rinsing with 70% alcohol ., B. 5.25% NaOCl for 30 second only, C. 5.25% NaOCl for 1 min. then rinsed in 50% alcohol., D. 5.25% NaOCl for 1 minute only.
A: 5.25%  NaOCl for 1 min. then rinsing with 70% alcohol .
Answer: A: 5.25%  NaOCl for 1 min. then rinsing with 70% alcohol . 
Explanation: “The Thermafiil GP carrier is disinfected with 5.25% NaOCl for 1 minute and then rinsed in 70% alcohol".