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: Pharmacology
[{'content': 'Thiopental sodium is administered intravenously as : \nSelect and explain. \nA. 25% solution, B. 2.5% solution, C. 0.25% solution, D. 0.025% solution', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]