This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breathing Systems, Subject name: Anaesthesia
[{'content': 'Maximum O2. concentration attained in venture mask is? \nSelect and explain. \nA. 90%, B. 100%, C. 60%, D. 80%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ANSWER: (C) 60%REF: Ajay Yadav 2ad ed p.35Equipment and oxygen delivered in %Nasal canula - 44%Venturi mask - 60%Oxygen mask - 60%Ventilators -100%', 'role': 'assistant'}]