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: Physiology
Pressure volume curves of a normal  subject and patient suffering from pulmonary disease is given below. What is this patient suffering from 
Select and explain. 
A. Pulmonary fibrosis, B. Asbestosis, C. Emphysema, D. Pulmonary congestion
C: Emphysema
Answer: C: Emphysema 
Explanation: None