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 Heliox – a) Helium is an inert gasb) Less viscous than airc) Higher density than aird) Reduces work of breathinge) Mixture of He & O2 \nSelect and explain. \nA. acd, B. ade, C. abd, D. ad', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Heliox is a mixture of helium (80%) and oxygen (20%). Heliox has a similar viscosity to air but a lower breathing and lowers airway resistance.\nHelium is an inert gas.', 'role': 'assistant'}]