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': 'Which of the following anesthetic agent does not cause hypotension on injection? \nSelect and explain. \nA. Propofol, B. Ketamine, C. Halothane, D. Thiopentone', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ketamine, sold under the brand name Ketalar among others, is a medication mainly used for starting and maintaining anesthesia. It induces a trance-like state while providing pain relief, sedation, and memory loss.', 'role': 'assistant'}]