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
In venturi mask maximum 02 concentration attained is : 
Select and explain. 
A. 90%, B. 100%, C. 60%, D. 80%
C: 60%
Answer: C: 60% 
Explanation: C i.e. 60% Equipment Maximum Oxygen Concentration Delivered Nasal Canula 44%Q Venturi mask/Oxygen mask 60%Q Ventilators 100% 0