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: Gynaecology & Obstetrics
[{'content': 'True labor pain includes all except \nSelect and explain. \nA. Painful uterine contraction, B. Sho vagina, C. Formation of the bag of waters, D. Cervical dilatalion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: True labor pain is characterized by painful uterine contractions, show, dilatation of internal os, the formation of the bag of waters.Reference:DC Dutta&;s Textbook of obstetrics,8th edition,page no:137.', 'role': 'assistant'}]