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: Pharmacology
[{'content': 'Deficiency of this haemophilic factor during early pregnancy will result in neural tube defect : \nSelect and explain. \nA. Folic acid, B. Iron, C. Cyanocobalamine, D. Antioxidants', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]