A 55 old women who has a history of sever depression and a radical mastectomy for carcinoma of breast one year back, develops polyuria noctiuria and excessive thirst. Laboratory values are as follows - Serum sodium 149 mEq/L. Serum potassium 3.6 mEq/L. Serum calcium 9.5 mg/dl. Glucose 110 mg/dl. BUN 30 mg/dl. Urine osmolatity 150 m Osm kg. The most likely clinical diagnosis would be -

• A. Psychogenic polydipsia
• B. Renal glycosuria
• C. Hypercalcemia
• D. Diabetes insipidus