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
Average pressure of uterine contractions during the first stage of labour is : 
Select and explain. 
A. 100 mm Hg, B. 15 mm Hg, C. 20 mm Hg, D. 30 mm Hg
D: 30 mm Hg
Answer: D: 30 mm Hg 
Explanation: 30 mm Hg