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': 'In a patient with fixed respiratory obstruction Helium is used along with Oxygen instead of plain oxygen because \nSelect and explain. \nA. It increases the absorption of oxygen, B. It decreases turbulence, C. It decreases the dead space, D. For analgesia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. It decreases turbulence', 'role': 'assistant'}]