This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Labour, Subject name: Gynaecology & Obstetrics
Mrs. S (G2 L1) presented to the hospital in labor pains. On examination she had 3 uterine contractions of 20 seconds in 10 minutes, cervical dilation 6 cm and HR 145 bpm. What is the stage of labor? 
Select and explain. 
A. Stage I, B. Stage II, C. Stage III, D. Stage IV
A: Stage I
Answer: A: Stage I 
Explanation: Ans. is a, i.e. Stage IAs discussed in chapter 7 of the book, first stage of labor is from the time when a female starts perceiving true labor pains and uptil 10 cm of dilatation.