This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory, Subject name: Medicine
[{'content': 'Shrinking lung syndrome is seen most commonly in - \nSelect and explain. \nA. SLE, B. Scleroderma, C. Rheumatoid arthritis, D. Ankylosingspondilytis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' SLE Shrinking Lung syndrome* First described by Hoffbrand and beck in 1965.* It manifests as dysnea and is best characterized as diaphragmatic dysfunction leading to diminished lung volumes.* Radiographic evaluation shows diaphragmatic elevation with bibasilar atelectasis - in the absence of parenchymal lung abnormalities.* PFT reveals a restrictive ventilator defect and a decrease in DLCO, that normailses when corrected for alveolar volume.* The hallmark of shrinking lung is the presence of these PFT features in the absence of parenchymal lung abnormalities but with disproportionately severe dysnea.* This is a typical feature of the pulmonary involvement of systemic lupus erythematosus.", 'role': 'assistant'}]