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': 'General anaesthetic most likely to cause bronchodilation is \nSelect and explain. \nA. Thiopentone, B. Ketamine, C. Propofol, D. Fentanyl', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]