This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
[{'content': 'Bih is defined as \nSelect and explain. \nA. The complete expulsion or extraction from the mother of a fetus after 20 weeks gestation, B. The complete expulsion or extraction from the mother of a fetus after 28 weeks gestation, C. The complete expulsion or extraction from the mother of a fetus after 38 weeks gestation, D. The complete expulsion or extraction from the mother of a fetus after 40 weeks gestation', 'role': 'user'}, {'content': "Answer: A \nExplanation: Bih: The complete expulsion or extraction from the mother of a fetus after 20 weeks gestation. In the absence of accurate dating criteria, fetuses weighing < 500 g are usually not considered as bihs but rather are termed abouses for purposes of vital statistics(Ref: William's Obstetrics; 25th edition)", 'role': 'assistant'}]