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': 'Macrocytic anaemia occurs in all,except - \nSelect and explain. \nA. Thiamine deficiency, B. Liver disease, C. Orotic aciduria, D. Copper deficiency', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]