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
A 5 year old boy suffering from Duchenne muscular dystrophy has to undergo tendon lengthening procedure. The most approp-riate anaesthetic would be: 
Select and explain. 
A. Induction with intravenous thiopentone and N20; and halothane for maintenance, B. Induction with intravenous suxamethonim and N20; and oxygen for maintenance, C. Induction with intravenous suxamethonium and N20; and halothane for maintenance, D. Inhalation induction with inhalation halothane and N20; oxygen for maintenance
A: Induction with intravenous thiopentone and N20; and halothane for maintenance
Answer: A: Induction with intravenous thiopentone and N20; and halothane for maintenance 
Explanation: A i.e. Induction with intravenous thiopentone and N20; and halothane for maintenance In this boy with duchene muscular dystrophy, there is high risk of malignant hypehermia. The earliest signs of malignant hypehermia are masseter muscle rigidity (MMR), tachycardia, and hypercarbia due to increased CO2 production.