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: Pharmacology
What causes malignant hyperpyrexia? 
Select and explain. 
A. Thiopentone, B. Cisatracurium, C. Propofol, D. Suxamethonium
D: Suxamethonium
Answer: D: Suxamethonium 
Explanation: None