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
Earliest fetal anomaly to be detected by USG : 
Select and explain. 
A. Hydrocephalous, B. Anencephaly, C. Achondroplasia, D. Spina bifida
B: Anencephaly
Answer: B: Anencephaly 
Explanation: Anencephaly