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
Which of the following is not a feature of idiopathic pulmonary hemosiderosis? 
Select and explain. 
A. Hemoptysis, B. Eosinopenia, C. Iron deficiency anemia, D. Diffuse alveolar hemorrhage
B: Eosinopenia
Answer: B: Eosinopenia 
Explanation: Eosinopenia