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: Gynaecology & Obstetrics
The effective pressure to be achieved in vacuum extraction is : 
Select and explain. 
A. 0.1 kg/cm2, B. 0.1 kg/cm2, C. 0.6 kg/cm2, D. 1.2 kg/cm2
C: 0.6 kg/cm2
Answer: C: 0.6 kg/cm2 
Explanation: 0.6 kg/cm2