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
Anaesthesia contraindicated in volvulus of gut is : 
Select and explain. 
A. Halothane, B. Nitrous oxide, C. Ketamine, D. Pancuronium
B: Nitrous oxide
Answer: B: Nitrous oxide 
Explanation: None