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': 'All except one belongs to intermediate pressure system of anaesthetic machine \nSelect and explain. \nA. Emergency oxygen flush, B. Yoke assembly system, C. Pipeline pressure gauge, D. Pipeline supply', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Yoke assembly system belongs to high pressure system of anaesthetic machine.', 'role': 'assistant'}]