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
During active labour cervical dilatation per hour in primi is: . 
Select and explain. 
A. 1.2 cms, B. 1.5 cms, C. 1.7 cms, D. 2 cms
A: 1.2 cms
Answer: A: 1.2 cms 
Explanation: Labour is said to active when:

Cervix is dilated to at least 3 – 4 cm.
Regular uterine contractions are present.
Rate of dilatation is at least 1.2 cm/hr for nulliparous and 1.5 cm/hr for parous women.