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 venturi mask maximum 02 concentration attained is : \nSelect and explain. \nA. 90%, B. 100%, C. 60%, D. 80%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. 60% Equipment Maximum Oxygen Concentration Delivered Nasal Canula 44%Q Venturi mask/Oxygen mask 60%Q Ventilators 100% 0', 'role': 'assistant'}]