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': 'Sodium hypochlorite in carisolv is used in concentration of \nSelect and explain. \nA. 2% w/v, B. 0.5% w/v, C. 1.5% w/v, D. 5% w/v', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]