This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Congenital CNS malformations, Subject name: Pediatrics
[{'content': 'Giving Folic acid in the periconceptional period lowers the risk of neural tube defects by: \nSelect and explain. \nA. 10%, B. 30%, C. 50%, D. 70%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: - Giving 0.4 mg/ 400ug Folic acid daily in the periconceptional period lowers the risk of neural tube defects by at least 50%', 'role': 'assistant'}]