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': 'Pancytopemia is caused by - \nSelect and explain. \nA. Aplastic anemia, B. MDS, C. Megaloblastic anaemia, D. All', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'a' i.e., Aplastic anaemia; 'b' i.e., MDS; 'c' i.e., Megaloblastic anaemia", 'role': 'assistant'}]