Periconceptional use of the following agent leads to reduced incidence of neural tube defects?: (A) Folic acid, (B) Iron, (C) Calcium, (D) Vitamin A
Answer is A. Folic acid supplementation (4mg a day) staing 4 weeks prior to conception up to 12 weeks of pregnancy is advised.This can reduce the incidence of neural tube defects.Reference: DC Dutta&;s Textbook of Obstetrics, 8th edition, page no:472