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
[{'content': 'Which of the following drugs is supposed to prevent congenital neural tube defects - \nSelect and explain. \nA. Thiamine, B. Riboflavin, C. Folic acid, D. Pyridoxine', 'role': 'user'}, {'content': "Answer: C \nExplanation: 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", 'role': 'assistant'}]