This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immune system, Subject name: Medicine
[{'content': 'Shrinking lung is a feature of \nSelect and explain. \nA. SLE, B. Rheumatoid ahritis, C. Sarcoidosis, D. Scleroderma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Shrinking lung syndrome (SLS) is an uncommon feature of systemic lupus erythematosus (SLE) characterized by dyspnea, pleuritic chest pain, diaphragmatic elevation, restrictive ventilatory defect and reduced respiratory muscle strength as measured by volitional tests. Ref - pubmed.com', 'role': 'assistant'}]