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: Surgery
Sellick's maneuver is: 
Select and explain. 
A. Application of pressure over cricoids cartilage to occlude oesophagus, B. Aims at avoiding oxygen entry into esophagus while performing mask ventilation, C. Both, D. None
C: Both
Answer: C: Both 
Explanation: Set tick's man over OR Application of pressure
Cricoids pressure over cricoids cartilage to occlude esophagus so as to avoid O2 entry into esophagus while doing