This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intravenous Anesthetic Agents, Subject name: Anaesthesia
[{'content': 'The presence of active bronchospasm intravenous anaesthetic agent of choice : \nSelect and explain. \nA. Ketamine, B. Thiopentone, C. Propofol, D. Etomidate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ketamine has well-characterized bronchodilatory activity. In the presence of active bronchospasm it is agent of Choice. Propofol is also bronchodilator etomidate is also bronchodilator all inhalational agents are bronchodilator Halothane is best', 'role': 'assistant'}]