This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pediatrics
Banana sign seen in the foetal brain suggests ? 
Select and explain. 
A. Renal agenesis, B. Encephalocele, C. Spina Bifida, D. Porencephaly
C: Spina Bifida
Answer: C: Spina Bifida 
Explanation: Banana sign in foetal brain suggest spina bifida. Reference: GHAI Essential pediatrics, 8th edition