This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
The daily dose of folic acid for women of childbearing age is? 
Select and explain. 
A. 4000 micro gm, B. 40 micro gm, C. 0.5 mg, D. 0.4 mg
D: 0.4 mg
Answer: D: 0.4 mg 
Explanation: ANSWER: (D) 0.4 mgREF: Novak's gynecology 13th edition - page 85"The Centers for Disease Control and Prevention has recommended that women of reproductive age who are capable of becoming pregnant take supplemental folic acid (0.4 mg daily) to help prevent neural tube defects in their infants"