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
A patient with limited systemic sclerosis for the past 10 years complains of shortness of breath for the past one year. His pulmonary function tests are as follows: 
Select and explain. 
A. Interstitial lung disease, B. Pulmonary artery hypertension, C. Pneumothorax, D. Diaphragmatic weakness
B: Pulmonary artery hypertension
Answer: B: Pulmonary artery hypertension 
Explanation: None