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': 'Pawn ball megakaryocytes are characteristic of - \nSelect and explain. \nA. Myelodysplastic syndrome, B. idiopathic thrombocytopenic purpura, C. Thrombotic thrombocytopenic purpura, D. Chloramphenicol toxicity', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]