This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Interstitial Lung Disease, Subject name: Medicine
A 35-year-old coal worker presents with difficulty in breathing on exeion for last 2 years. CXR was performed. What does it show? 
Select and explain. 
A. Emphysema, B. Reticulonodular infiltrates, C. Pulmonary fibrosis, D. Cardiac atrophy
A: Emphysema
Answer: A: Emphysema 
Explanation: The CXR of Coal worker patient shows the presence of hyperinflation in lungs with a tubular appearance of the hea. Lungs appear relatively blacker with flattening of the diaphragm on both sides. The hea appears smaller as lungs are hyper-inflated. These findings are suggestive of emphysema.