This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
A 26-year-old female presents for ante natal visit. She has a history of aboion in last pregnancy due to neural tube defect in the fetus. What is the amount of folic acid that should be prescribed to this female? 
Select and explain. 
A. 4 micrograms per day, B. 40 micrograms per day, C. 400 micrograms per day, D. 4000 micrograms per day
D: 4000 micrograms per day
Answer: D: 4000 micrograms per day 
Explanation: *All women of childbearing age and who are capable of becoming pregnant should take 0.4mg (=400mcg) of folic acid daily. *If pregnancy is planned in high-risk women(previously affected child), supplementation should be staed with 4mg (=4000microgram) of folic acid daily, beginning 1 month before the time of the planned conception. REF NELSON 19TH ED.