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: Biochemistry
[{'content': '28 year old primigravida gave birth to a male child which presented with midline dimple and tuft of hair in the lower back, which vitamin supplementation could have possibly prevented this if if was due to nutritional deficiency in the mother \nSelect and explain. \nA. Vitamin B9, B. Vitamin B6, C. Vitamin B12, D. Vitamin B3', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The child has presented with spina bifida occulta.\nVitamin B9 (folic acid) deficiency in pregnant female can cause neural tube defects (spina bifida, Anencephaly) in the baby.', 'role': 'assistant'}]