This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
[{'content': 'The abnormal preoperative pulmonary function test in a patient with severe kyphoscoliosis includes \nSelect and explain. \nA. Normal RV and decreasd TLC, B. Reduced FEV1/ FVC, C. Reduced FEV 25-75, D. Increased FRC', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In severe kyphoscoliosis RV is normal TLC decreased FRC decreased/normal FVC decreases', 'role': 'assistant'}]