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 one of the following is not likely to be associated with pulmonary flbrosis ? \nSelect and explain. \nA. Coal miners lung, B. Primary sclerosis cholangitis, C. Primary biliary cirrhosis, D. Ankylosing spondylitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]