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
Shrinking lung is a feature of 
Select and explain. 
A. SLE, B. Rheumatoid ahritis, C. Sarcoidosis, D. Scleroderma
A: SLE
Answer: A: SLE 
Explanation: 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