When should folic acid be taken by pregnant women of affectively reduce the chances of neural tube deffect?

when should folic acid be taken by pregnant women of affectively reduce the chances of neural tube deffect?
a. 1 month b4 1st trimester
b. 1st trimester
c. 2nd trimester
d. 3rd trimester

when should folic acid be taken by pregnant women of affectively reduce the chances of neural tube deffect

Ans A