A 60-year-old male with history of benign prostatic hypertrophy presents complaining of nausea and vomit- ing. Laboratory values include serum Na of 145 mmol/L, blood urea nitrogen (BUN) of 45 mg/dL, creatinine of 2.0 mg/dL, urine Na of 10, and urine creatinine of 80. Which of the following is the MOST likely diagnosis?
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(A) Prerenal failure
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(B) Acute tubular necrosis (ATN)
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(C) Glomerulonephritis
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(D) Postrenal failure
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(E) Pyelonephritis