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
Recommend time for using8% glulataraldehyde for pulpotomy: 
Select and explain. 
A. 30sec, B. 1minute., C. 2minute., D. 4minute
C: 2minute.
Answer: C: 2minute. 
Explanation: 2%, 4% and 8% buffered glutaraldehyde solutions can be used. 
2% is used for pulpotomies in primary teeth.
The recommended time for 4% is 4 min and 8% is 2 min.