This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Second Stage of Labor, Subject name: Gynaecology & Obstetrics
[{'content': "Duration of second stage of labor depends upon - \nSelect and explain. \nA. Size of fetus, B. Mother's build, C. Parity, D. Lie of fetus", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Parity o The duration of the normal second stage is usually very much shorter than the normal first staee of labour.o As with the first stage the duration of the second stage will mainly depend on whether it is the first labour or the woman has previously given birth to a viable infant i. e. it depends on the parity status of the mother.o It may also depend on the presence of associated complications i.e. cephalopelvic disproportion.", 'role': 'assistant'}]