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
[{'content': 'True about N2O: \nSelect and explain. \nA. Pin index 3,5, B. Blue in colour, C. Stored as liquid, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A. i.e. Pin index 3, 5 B. i.e. Blue in colour, C. i.e. Stored as liquid', 'role': 'assistant'}]