<prompt> Which of the following drugs is supposed to prevent congenital neural tube defects -ThiamineRiboflavinFolic acidPyridoxine  <response>: Folic acid plays a role in synthesis of nucleic acids. It is needed for normal development of blood cells in the marrow. REF. PARKS TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 620 