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 seen in which fetal nomalies : \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 defect Signs of Spina bifida on Ultrasound Small 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 megna.', 'role': 'assistant'}]