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
In a young patient who had extensive soft tissue and muscle injury, which of these muscle relaxants used for endotracheal intubation might lead to cardiac arrest – 
Select and explain. 
A. Atracurium, B. Suxamethonium, C. Vecuronium, D. Pancuronium
B: Suxamethonium
Answer: B: Suxamethonium 
Explanation: Sch can cause dangerous hyperkalemia in patients with extensive soft tissue & muscle injury (crush injury) which may cause cardiac arrest.