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
Normal crown-rump length at bih is : 
Select and explain. 
A. 20-25 cms., B. 38-50 cms, C. 80-72 cms, D. 78-85 cms
B: 38-50 cms
Answer: B: 38-50 cms 
Explanation: 38-50 cms