This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Focal lupus nephritis in renal biopsy specimen belong to which class of SLE nephritis according to the international society of nephrology and renal pathology lassification: 
Select and explain. 
A. Class III, B. Class IV, C. Class IV B, D. Class V
A: Class III
Answer: A: Class III 
Explanation: Classification of Lupus Nephritis (International Society of Nephrology and Renal Pathology Society) Class I: Minimal Mesangial Lupus Nephritis Class II: Mesangial Proliferative Lupus Nephritis Class III: Focal Lupus Nephritis Class IV: Diffuse Lupus Nephritis Class V: Membranous Lupus Nephritis Class VI: Advanced Sclerotic Lupus Nephritis Ref:Harrison,E-18,P-2733.