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: Pediatrics
[{'content': 'Banana sign seen in the foetal brain suggests – \nSelect and explain. \nA. Renal agenesis, B. Encephalocele, C. Spina bifida, D. Porencephaly', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]