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: Pathology
[{'content': 'Deficiency of folic acid leads to \nSelect and explain. \nA. Pernicious anemia, B. Megaloblastic anemia, C. Iron deficiency anemia, D. Thalassemia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]