This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Anatomy
[{'content': 'True labour pains include all except : \nSelect and explain. \nA. Painful uterine contraction, B. Sho vagina, C. Progressive descent of presenting pa, D. Cervical dilatation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: True labour pains: Cervical dilatation Regular and gradual increase in duration and frequency of contractions Bag of water is formed Associated with show Painful uterine contractions. Ref: Datta Obs 9e pg 110.', 'role': 'assistant'}]