This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical Illness Complicating Pregnancy, Subject name: Gynaecology & Obstetrics
[{'content': 'Which vitamin deficiency is most commonly seen in a pregnant mother who is on phenytoin therapy for epilepsy? \nSelect and explain. \nA. Vitamin B6, B. Vitamin B12, C. Vitamin A, D. Folic acid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Phenytoin inhibits the enzyme intestinal conjugase, an impoant enzyme in folic A. Metabolism. Folate is present in food in a polyglutamate form. This is conveed into monoglutamates by intestinal conjugase to be absorbed in the jejunum. Phenytoin acts by inhibiting this enzyme thereby causing folate deficiency and thus megaloblastic anemia.', 'role': 'assistant'}]