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: Radiology
Sonographic finding of spina bifida – a) Ventriculomegalyb) Obliteration of cisterna magnac) Small BPDd) Abnormal curvature of cerebellume) Club foot 
Select and explain. 
A. acd, B. bcd, C. abc, D. abd
D: abd
Answer: D: abd 
Explanation: Sonographic findings of spina bifida 

Most common site is lumbosacral region.
Ventriculomegaly with hydrocephalus.
Banana sign - cerebellum is stretched around the brain stem with effacement of cisterna magna.
Lemon sign - Flattening of frontal bones on transverse image.
Bony defect in spine: -
	V shaped profile due to outward flaring of two posterior ossification centres.
	Presence of intact sac on posterior aspect of spine.
	Sac filled with fluid or solid tissue in meningocele or myelomeningocele.