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
[{'content': 'During active labour cervical dilatation per hour in primi is: . \nSelect and explain. \nA. 1.2 cms, B. 1.5 cms, C. 1.7 cms, D. 2 cms', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Labour is said to active when:\n\nCervix is dilated to at least 3 – 4 cm.\nRegular uterine contractions are present.\nRate of dilatation is at least 1.2 cm/hr\xa0for nulliparous and 1.5 cm/hr\xa0for parous women.', 'role': 'assistant'}]