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': 'Which of the following is not the cause of macrocytic anemia \nSelect and explain. \nA. Orotic aciduria, B. Lesch Nyhan syndrome, C. Transcobalamin deficiency, D. Abetalipoproteinemia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Abetalipoproteinemia has Acanthocytes (Spur cells).\nIt is not a cause of macrocytic anemia.', 'role': 'assistant'}]