This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Anaesthesia
[{'content': 'Indications for hypotensive anaesthesia include \nSelect and explain. \nA. Mastoid surgery, B. Spinal surgery, C. Arteriovenous malformations, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (D) All of the above', 'role': 'assistant'}]