Review Question - QID 109980

A 72-year-old man is brought to the emergency department by his daughter because he was found to have decreased alertness that has gotten progressively worse. Three weeks ago he was diagnosed with an infection and given an antibiotic, though his daughter does not remember what drug was prescribed. His medical history is also significant for benign prostatic hyperplasia and hypertension, for which he was prescribed tamsulosin, a thiazide, and an ACE inhibitor. He has not sustained any trauma recently, and no wounds are apparent. On presentation, he is found to be confused. Labs are obtained with the following results:

Serum:
Na+: 135 mEq/L
BUN: 52 mg/dL
Creatinine: 2.1 mg/dL

Urine:
Osmolality: 548 mOsm/kg
Na+: 13 mEq/L
Creatinine: 32 mg/dL

Which of the following etiologies would be most likely given this patient's presentation?