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': 'High spinal anaesthesia characterized by: September 2012 \nSelect and explain. \nA. Hypeension and tachycardia, B. Hypeension and bradycardia, C. Hypotension and bradycardia, D. Hypotension and tachycardia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C i.e. Hypotension and bradycardia Spinal anaesthesia Site of SA in adults: L2-L3/ L3-L4 space Site of SA in children: L4-L5 space Site of action of SA: Nerve roots of cauda equina Fibres which are blocked earliest: Autonomic pre-ganglionic fibres (sympathetic) Percentage of xylocaine used in SA: 5% Feature of high spinal anaesthesia: - Hypotension and - Bradycardia', 'role': 'assistant'}]