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ANSWER: D The use of anticoagulant therapy (warfarin, dabigatran, rivaroxaban, among others) can result in AKI by causing glomerular hemorrhage and renal tubular obstruction by RBC casts. This may be a serious potential complication especially in older patients with underlying chronic kidney injury. References: Glassock RJ. Anticoagulant-Related Nephropathy It's the Real McCoy. CJASN 14:935-937, 2019. Brodsky S, Eikelboom J, Hebert LA. Anticouagulant-Related Nephropathy. J Am Soc Nephrol 29:2787-2793, 2018. Brodsky S, Satoskar A, et al. Acute Kidney Injury During Warfarin Therapy Associated with Obstructive Tubular Red blood Cell Casts: A Report of Nine Cases. Am J Kidney Dis 54(6):1121-6, 2009....