This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and health, Subject name: Social & Preventive Medicine
Which of the following drugs is supposed to prevent congenital neural tube defects - 
Select and explain. 
A. Thiamine, B. Riboflavin, C. Folic acid, D. Pyridoxine
C: Folic acid
Answer: C: Folic acid 
Explanation: Folic acid plays a role in synthesis of nucleic acids. It is needed for normal development of blood cells in the marrow. REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 620