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 anaesthetic agent does not cause hypotension on injection ? \nSelect and explain. \nA. Ketamine, B. Propofol, C. Halothane, D. Thiopentone', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ketamine causes increase in BP.', 'role': 'assistant'}]