This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
What is the diagnosis? <img src=" /> 
Select and explain. 
A. Pneumothorax, B. Emphysema, C. Bronchiectasis, D. Cardiomegaly
B: Emphysema
Answer: B: Emphysema 
Explanation: Emphysema is commonly seen on CXR as diffuse hyperinflation with increased lucency, flattening of diaphragms, increased anteroposterior, increased retrosternal spaceRef: Harrison 19e pg: 308, e-5