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
Giving Folic acid in the periconceptional period lowers the risk of neural tube defects by: 
Select and explain. 
A. 10%, B. 30%, C. 50%, D. 70%
C: 50%
Answer: C: 50% 
Explanation: - Giving 0.4 mg/ 400ug Folic acid daily in the periconceptional period lowers the risk of neural tube defects by at least 50%