This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
[{'content': 'Dose of folic acid for women at increased risk of Neural tube defects preconceptionally is \nSelect and explain. \nA. 4ng, B. 4mcg, C. 4mg, D. 4g', 'role': 'user'}, {'content': "Answer: C \nExplanation: Most women at increased risk for NTDs benefit from 4 mg folic acid taken daily before conception and through the first trimester. This is paicularly impoant if a woman has one or more prior affected children or if either the pregnant woman or her paner has such a defect. Folic acid supplementation may not decrease the risk for NTDs in those with valproic acid exposure, pregestational diabetes, first-trimester fever or hot tub exposure, or defects associated with a genetic syndrome (Ref: William's Obstetrics; 25th edition)", 'role': 'assistant'}]