This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
All are true about Diabetes insipidus except? 
Select and explain. 
A. Low urine osmolality, B. Dilutional Hyponatremia, C. Water deprivation test is used for diagnosis, D. Polyuria
B: Dilutional Hyponatremia
Answer: B: Dilutional Hyponatremia 
Explanation: Answer- B. Dilutional HyponatremiaIn diabetes insipidus, the serum osmolality is increased with inappropriately low urine osmolality.There is polyuria, as ADH deficienry causes excessive water loss in urine.