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ANSWER: D The most common finding on kidney biopsies in patients with immune checkpoint inhibitors (ICPIs)–induced AKI is acute tubulointerstitial nephritis. Less frequently, granulomatous interstitial nephritis and TMA have also been reported. The two main ICPIs are anti-cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) and anti-programmed cell death protein 1 (PD-1). The onset of kidney injury seen with PD-1 inhibitors is usually late (3-10 months) compared to CTLA-4 antagonists-related renal injury, which happens earlier (2-3 months). PD-1 inhibitors, as opposed to CTLA-4 inhibitors, have been associated with kidney rejection in transplantation. Steroids appear to be effective in treating the immune-related adverse effects...