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
As per GOLD criteria, COPD is termed very severe when FEV1 is 
Select and explain. 
A. >=80% predicted, B. >=50% but <80%, C. >=30% but <50%, D. <30% predicted
D: <30% predicted
Answer: D: <30% predicted 
Explanation: GOLD Criteria for Severity of Airflow Obstruction in COPDGOLD stageSeveritySpirometryIMildFEV1/FVC <0.7 and FEV1 >=80% predictedIIModerateFEV1/FVC <0.7 and FEV1 >=50% but <80%predictedIIISevereFEV1/FVC <0.7 and FEV1 >=30% but <50%predictedIVVery severeFEV1/FVC <0.7 and FEV1 <30% predictedRef: Harrison 19e pg: 1704