This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Primary Immunodeficiency, Subject name: Pediatrics
[{'content': 'Class IV lupus nephritis is: \nSelect and explain. \nA. Mesangial lupus nephritis, B. Proliferative lupus nephritis, C. Membranous lupus nephritis, D. Diffuse lupus nephritis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Classification of Lupus Nephritis Class I Minimal Mesangial Lupus Nephritis Class II Mesangial Proliferative Lupus Nephritis Class III Focal Proliferative Lupus Nephritis Class IV Diffuse Proliferative Lupus Nephritis Class V Membranous Lupus Nephritis Class VI Advanced Sclerotic Lupus Nephritis', 'role': 'assistant'}]