This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intra Uterine Growth Restriction, Intrapaum and Antepaum Fetal Surviellance, Subject name: Gynaecology & Obstetrics
[{'content': "'Frog eyes' appearance on USG is seen in : \nSelect and explain. \nA. Spina bifida, B. Anencephaly, C. Cleft lip & palate, D. Down syndrome", 'role': 'user'}, {'content': "Answer: B \nExplanation: FROG EYE SIGN Anencephaly on ultrasound On coronal ultrasound, the absence of the calvaria coupled with prominent orbits gives the fetus the 'frog eye' sign", 'role': 'assistant'}]