This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnosis in Obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'Banana and lemon sign is seen in which fetal anomalies? \nSelect and explain. \nA. Neural tube defect, B. Hydrops fetalis, C. Twins, D. IUD', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is a, i.e. Neural tube defectRef. Williams Obs. 23/e, p 354, 355Signs of Spina bifida on UltrasoundSmall biparietal diameter.Ventriculomegaly.Frontal bone scalloping or the so called lemon sign.Elongation and downward displacement of the cerebellum-the so called banana sign.Effacement or obliteration of the cisterna magna.', 'role': 'assistant'}]