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
Bih is defined as 
Select and explain. 
A. 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
A: The complete expulsion or extraction from the mother of a fetus after 20 weeks gestation
Answer: A: The complete expulsion or extraction from the mother of a fetus after 20 weeks gestation 
Explanation: 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)