This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: COPD and Asthma, Subject name: Medicine
[{'content': 'A patient on spirometry shows FEV1/FVC <0.7 and FEV1 >=30% but <50% predicted. Patients diagnosis according to GOLD criteria is? \nSelect and explain. \nA. Mild COPD, B. Moderate COPD, C. Severe COPD, D. Very severe COPD', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Patient with these findings FEV1/FVC <0.7 and FEV1 >=30% but <50% predicted suggestive of diagnosis of Severe grade of COPD GOLD Stage Severity Spirometry I Mild FEV1/FVC <0.7 and FEV1 >=80% predicted II Moderate FEV1/FVC <0.7 and FEV1 >=50% but <80% predicted III Severe FEV1/FVC <0.7 and FEV1 >=30% but <50% predicted IV Very severe FEV1/FVC <0.7 and FEV1 <30% predicted', 'role': 'assistant'}]