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: Medicine
[{'content': 'Megaloblastic anemia should be treated be treated with both folic acid vitamin B12 because - \nSelect and explain. \nA. Folic acid alone causes, improvement of hematologic symptoms but worsening of neurological symptoms, B. It is a Co factor, C. It is enzyme, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]