This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast, Subject name: Pathology
[{'content': 'Extra-aicular manifestations of RA - \nSelect and explain. \nA. Scleritis, B. Pericarditis, C. Pulmonary fibrosis, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Although Rheumatoid ahritis is a symmetric polyaicular ahritis there are also many extra aicular manifestations like scleritis, pericarditis, and pulmonary fibrosis etc. The clinical features of Rheumatoid ahritis is highly variable. Ref: Robbins basic pathology 9th edition page no 785,786', 'role': 'assistant'}]