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ANSWER: C By the Oxford Classification of IgA nephropathy, the findings present are classified as "M1 E1 S1 T1 C0" (where M=Mesangial hypercellularity; E=Endocapillary proliferation; S=Segmental sclerosis; T=Tubular atrophy & interstitial fibrosis; C=Cellular/fibrocellular crescents). REFERENCE: Trimarchi H, et al. Oxford Classification of IgA Nephropathy 2016: an update from the IgA Nephropathy Classification Working Group. Kidney Int 2017; 91(5):1014-21.