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
Which of the following collagen disorder is NOT commonly associated with pulmonary fibrosis - 
Select and explain. 
A. SLE, B. Progressive systemic sclerosis, C. Dermatomyositis, D. Rheumatoid arthritis
C: Dermatomyositis
Answer: C: Dermatomyositis 
Explanation: None