This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
The total duration of pregnancy is : 
Select and explain. 
A. 270 days, B. 280 days, C. 290 days, D. 276 days
B: 280 days
Answer: B: 280 days 
Explanation: 280 days