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: Surgery
[{'content': 'Differential white blood cell counts in the laboratory are useful in the diagnoses of? \nSelect and explain. \nA. Anemia, B. Eosinophilia, C. Spherocytoses, D. Thrombocytopenic purpura', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]