This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthetic equipments, Subject name: Anaesthesia
[{'content': 'In venturi mask maximum 02 concentration attained is \nSelect and explain. \nA. 90%, B. 100%, C. 60%, D. 80%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In Venturi mask normal O2 concentration is between 24 and 60% . In non breathing masks oxygen saturation is between 80 and 90%.', 'role': 'assistant'}]