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
Succinylcholine is used with caution in all except 
Select and explain. 
A. Mythenia gravis, B. Burns, C. Crush injury, D. Tachycardia
D: Tachycardia
Answer: D: Tachycardia 
Explanation: 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