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
All the following cause malignant hyperpyrexia except ? 
Select and explain. 
A. N20, B. Halothane, C. Methoxyflurane, D. Isoflurane
A: N20
Answer: A: N20 
Explanation: A i.e. N20