Categorize the following causes of acute kidney injury (AKI) as prerenal, intrarenal, or postrenal:

Severe Dehydration

Sepsis

Acute Tubular Necrosis (ATN)

CHF (Congestive Heart Failure)

Gentamicin (Aminoglycoside antibiotic toxicity)

Benign Prostatic Hyperplasia (BPH)

Renal Calculi (Kidney Stones)