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': 'Which of the following is not a feature of idiopathic pulmonary hemosiderosis? \nSelect and explain. \nA. Hemoptysis, B. Eosinopenia, C. Iron deficiency anemia, D. Diffuse alveolar hemorrhage', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Eosinopenia', 'role': 'assistant'}]