This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
Periconceptional use of the following agent teads to reduced incidence ol neural tube defects : 
Select and explain. 
A. Folic acid, B. Iron, C. Calcium, D. Vitamin A
A: Folic acid
Answer: A: Folic acid 
Explanation: Ans. is a i.e. Folic acid