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
Anencephaly is earliest diagnosed at : 
Select and explain. 
A. 6 weeks, B. 10 weeks, C. 14 weeks, D. 18 weeks
B: 10 weeks
Answer: B: 10 weeks 
Explanation: 10 weeks