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
[{'content': 'Recommend time for using8% glulataraldehyde for pulpotomy: \nSelect and explain. \nA. 30sec, B. 1minute., C. 2minute., D. 4minute', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 2%, 4% and 8% buffered glutaraldehyde solutions can be used.\xa0\n2% is used for pulpotomies in primary teeth.\nThe recommended time for 4% is 4 min and 8% is 2 min.', 'role': 'assistant'}]