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
Maximum 02 concentration attained in venture mask is? 
Select and explain. 
A. 90%, B. 100%, C. 60%, D. 80%
C: 60%
Answer: C: 60% 
Explanation: 60% REF: Ajay Yadav 2nd ed p.35 Equipment and oxygen delivered in % * Nasal canula - 44% * Venturi mask - 60% * Oxygen mask - 60% * Ventilators - 100%