This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary tract, Subject name: Pathology
Diffuse proliferative glomerulonephritis, in lupus nephritis falls under- 
Select and explain. 
A. Class II, B. Class III, C. Class IV, D. Class V
C: Class IV
Answer: C: Class IV 
Explanation: According to the WHO, six patterns of mutually-merging renal lesions are seen in lupus nephritis: Class I: Minimal lesions. Class II: Mesangial lupus nephritis. Class III: Focal segmental lupus nephritis. Class IV: Diffuse proliferative lupus nephritis Class V: Membranous lupus nephritis Class VI: Sclerosing lupus nephritis. Ref: HARSH MOHAN TEXTBOOK OF PATHOLOGY 6th ed. pg no: 676