Answer: B, Cortex and medulla
Per the 2018 Banff reference guide for the evaluation of transplant biopsies, an adequate specimen is one that contains at least 10 glomeruli and at least 2 arteries. Additionally, the guidelines stipulate that there should be at least two cores or two separate areas of cortex in the same core in order to meet adequacy criteria. Of note, the minimally acceptable criteria, per Banff guidelines, are 7 glomeruli and one artery.
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