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
Banana and lemon sign is seen in which fetal anomalies: 
Select and explain. 
A. Neural tube defect, B. Hydrops fetalis, C. Twins, D. IUD
A: Neural tube defect
Answer: A: Neural tube defect 
Explanation: 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.