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
[{'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: Signs of Spina bifida on Ultrasound\n\nSmall biparietal diameter.\nVentriculomegaly.\nFrontal bone scalloping or the so called lemon sign.\nElongation and downward displacement of the cerebellum-the so called banana sign.\nEffacement or obliteration of the cisterna megna.', 'role': 'assistant'}]