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
[{'content': 'Which of the following collagen disorder is NOT commonly associated with pulmonary fibrosis \nSelect and explain. \nA. SLE, B. Progressive systemic sclerosis, C. Dermatomyositis, D. Rheumatoid arthritis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]