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': 'Macrocytic anemia may be seen in all of these except- \nSelect and explain. \nA. Liver disease, B. Copper deficiency, C. Thiamine deficiency, D. Vitamin B12 deficiency', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Copper deficiency is manifested by hypochromic normocytic anemia, osteopenia, depigmentation, mental retardation and psychomotor abnormalities.\nThiamine, pyridoxine and Bl2 deficiency leads to megaloblastic anemia.\nClassification of megaloblastic anemia', 'role': 'assistant'}]