<prompt> Class IV lupus nephritis is:Mesangial lupus nephritisProliferative lupus nephritisMembranous lupus nephritisDiffuse lupus nephritis  <response>: 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 