<prompt> Folic acid required in first trimester of pregnancy in a woman with a history of NTD is:100 microgram400 microgram4 mg5 mg  <response>: Ans. C. 4mga. More than half of NTDs could be prevented with daily intake of 400IgM of folic acid throughout the periconceptional period.b. A woman with a prior pregnancy complicated by a neural tube defect can reduce the 23 recurrence risk by more than 70 if she takes 4mg 4000ug of folic acid for the month before conception and for the first trimester of pregnancy. 