This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscle relaxants, Subject name: Anaesthesia
[{'content': 'Succinylcholine is used with caution in all except \nSelect and explain. \nA. Mythenia gravis, B. Burns, C. Crush injury, D. Tachycardia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Sch is the only muscle relaxant that causes vagal stimulation and causes bradycardia (attenuates tachycardia and hypeension ) In burns, crush injury and myasthenia gravis can cause severe hyperkalemia. Ref: Morgan 4th/e p 214', 'role': 'assistant'}]