This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuromuscular Blocker, Subject name: Anaesthesia
The cricoid pressure applied should approximately have following pressure- 
Select and explain. 
A. 20 N, B. 30 N, C. 40 N, D. 5 N
B: 30 N
Answer: B: 30 N 
Explanation: Cricoid pressure describes the backward displacement of the complete cailaginous cricoid ring against the cervical veebrae to occlude the hypopharynx. The technique usually involves the application of a 10 N force before induction; increasing this force to 30 N on loss of consciousness. Thiy Newtons are considered enough to maintain a barrier pressure, but minimize airway obstruction or distoion. It should be removed immediately if active vomiting occurs as there is a risk of oesophageal rupture.