<prompt> Folic acid required in first trimester of pregnancy in a women with a history of NTD is :100 microgram400 microgram4 mg5 mg  <response>: Ans. is c i.e., 4 mg More than half of NTDs could be prevented with daily intake of 400 pgm of folic acid throughout the periconceptional period. 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 4 mg 4000 fig of folic acid for the month before conception and for the first trimester of pregnancy. 