This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Airway, Subject name: Anaesthesia
The laryngeal mask airway allows positive pressure ventilation with maximum pressure of:- 
Select and explain. 
A. 10 cm H2O, B. 20 cm H2O, C. 30 cm H2O, D. 40 cm H2O
B: 20 cm H2O
Answer: B: 20 cm H2O 
Explanation: The LMA allows a positive pressure of 20 cm of H2O for ventilation .