A 45-Year-Old Man Visits His Physician with Complaints of Insatiable

A 45-year-old man visits his physician with complaints of insatiable thirst,sudden onset of fatigue,polydipsia,and polyuria.Laboratory results indicate a normal fasting blood sugar.Serum sodium was slightly elevated.Urine was clear and had low specific gravity (hypotonic) .The most likely cause of these symptoms and laboratory results would be:

A) diabetes mellitus.
B) acute tubular necrosis.
C) polycystic kidney disease.
D) diabetes insipidus.