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': 'Which intravenous anesthetic is a potent bronchodilator/ choice of agent in asthmatic patient: \nSelect and explain. \nA. Propofol, B. Thiopentone, C. Ketamine, D. Midazolam', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]