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
The approximate time in which ferric sulphate dampened in a cotton pellet is put to the root stump while performing pulpotomy is 
Select and explain. 
A. 10-15 secs, B. 60-90 secs, C. 2-3 mins, D. 4-5 mins
A: 10-15 secs
Answer: A: 10-15 secs 
Explanation: None