This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematology, Subject name: Pharmacology
Deficiency of this haemophilic factor during early pregnancy will result in neural tube defect: 
Select and explain. 
A. Folic acid, B. Iron, C. Cyanocobalamine, D. Antioxidants
A: Folic acid
Answer: A: Folic acid 
Explanation: Folio acid deficiency in mothers would lead to neural tube defects. Hence folio acid is given 500mcg daily orally. From essential of medical pharmacology K D Tripati page no 610 and Medical pharmacology padmaja 4th edition page no 331