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
[{'content': 'True labour pain includes all except: \nSelect and explain. \nA. Painful uterine contraction, B. Short vagina, C. Formation of the bag of waters, D. Progressive descent of presenting part', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is b, i.e. Short vaginaRef. Dutta Obs. 7/e, p 117Differences between true and false labour pains.FeaturesTrue labour painsFalse labour painsCervical changes (dilatation & effacement)PresentAbsentFrequency and duration of contractionsRegular and gradually increaseIrregularPainLower abdomen and back, radiating to thighsLower abdomen onlyBag of waterFormedNot formedShowPresentAbsentRelief with enema/sedationNoNo', 'role': 'assistant'}]