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
All of the following are true about Idiopathic Pulmonary Hemosiderosis Except: 
Select and explain. 
A. Hypoxemia, B. Alveolar capillary constriction, C. Hyperplasia of type II Pneumocytes, D. Hemosiderin laden macrophages
B: Alveolar capillary constriction
Answer: B: Alveolar capillary constriction 
Explanation: Answer is B (Alveolar capillary constriction): Idiopathic Pulmonary Hemosiderosis is associated with alveolar capillary dilatation and not alveolar capillary constriction. Pathological Features of Idiopathic Pulmonary Hemosiderosis Bland Alveolar hemorrhage (without capillaritis or inflammation of blood vessels) Hyperplasia of type H pneumocytes Alveolar capillary dilatation and touosity Hemosiderin laden macrophages in alveolar spaces of interstitium