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': 'Maximum 02 concentration attained in venture mask is? \nSelect and explain. \nA. 90%, B. 100%, C. 60%, D. 80%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 60% REF: Ajay Yadav 2nd ed p.35 Equipment and oxygen delivered in % * Nasal canula - 44% * Venturi mask - 60% * Oxygen mask - 60% * Ventilators - 100%', 'role': 'assistant'}]