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: Anaesthesia
[{'content': 'Dose of thiopentone used is \nSelect and explain. \nA. 2%, B. 2.50%, C. 3%, D. 5%', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 2.50%', 'role': 'assistant'}]