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
[{'content': "Sellick's maneuver is: \nSelect and explain. \nA. 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", 'role': 'user'}, {'content': "Answer: C \nExplanation: Set tick's man over OR Application of pressure\nCricoids pressure over cricoids cartilage to occlude esophagus so as to avoid O2 entry into esophagus while doing", 'role': 'assistant'}]