This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: DNB 2018, Subject name: Anaesthesia
[{'content': 'In a patient with severe aoic Stenosis which of the following anesthetic techniques is least preferred: \nSelect and explain. \nA. Propofol induction, B. Etomidate induction, C. Spinal anesthetic with 15 mg bupivacaine, D. Epidural anesthesia with 2 % lidocaine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Spinal anesthesia is an absolute contra-indication in severe hea disease as it can cause severe hemodynamic instability Etomidate is cardio vascular stable Propofol can be used with caution in patients with severe hea disease Epidural anesthesia can be used with caution in patient with severe hea disease', 'role': 'assistant'}]