This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood, Subject name: Pediatrics
[{'content': 'A healthy 3-year-old girl presents with acute onset of petechiae, purpura, and epistaxis. Her Hb 12 g/dl, WBC 5550/mm3, platelet count 2000/mm3. The most likely diagnosis is: \nSelect and explain. \nA. ITP, B. ALL, C. Aplastic anemia, D. DIC', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Idiopathic thrombocytopenic purpura (ITP)ITP is most commonly seen in previously healthy children, who may have encountered a recent viral infection. Because the pathogenesis involves peripheral destruction of platelets, the BM appears normal and other hemic lineages are not affected (unlike the case for acute leukemia or aplastic anemia). In contrast to patient with ITP, child with DIC usually is extremely ill.', 'role': 'assistant'}]