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ANSWER: C The Oxford IgAN Classification takes in consideration the percentage of interstitial fibrosis and tubular atrophy (T) as one of the histologic findings to predict outcome, irrespective of treatment. T0 represents <25%, T1 26-50% and T2 >50% cortical involvement. REFERENCES: 1. Trimarchi et al. Oxford Classification of IgA nephropathy 2016: an update from the IgA Nephropathy Classification Working Group. Kidney Int 2017; 91(5):1014-1021. 2. Haas et al. A multicenter study of the predictive value of crescents in IgA nephropathy. J Am Soc Nephrol 2017; 28:691-701.