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
Indications for hypotensive anaesthesia include 
Select and explain. 
A. Mastoid surgery, B. Spinal surgery, C. Arteriovenous malformations, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: (D) All of the above