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 agents is contraindicated in patients with hypeension? \nSelect and explain. \nA. Ketamine, B. Propofol, C. Etomidate, D. Diazepam', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ketamine produces a increase in both systolic and diastolic blood pressure in a dose dependent manner and thus it is mostly avoided in patients with a history of hypeension. Ref: Irwin and Rippe's Intensive Care Medicine 6th edition, Page 215 - 216; Goldfrank's Toxicologic Emergencies 8th edition, Page 1235 - 1236.", 'role': 'assistant'}]