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 agents is contraindicated in patients with hypertension ? \nSelect and explain. \nA. Ketamine, B. Propofol, C. Etomidate, D. Diazepam', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ketamine increases BP, HR & myocardial O2 demand, therefore it is contraindicated in IHD, hypertensive heart disease and aortic aneurysm.', 'role': 'assistant'}]