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: Physiology
Which of the following feature(s) is/are suggestive of nehogrnic DI in comparison to central DI : 
Select and explain. 
A. Desmopressin nasal spray restore urine output to normal level, B. Basal vasopressin level > 1 pg/ml, C. Normal posterior pituitary bright spot is not visible on MRI scan, D. Change in water loss during fluid deprivation test
B: Basal vasopressin level > 1 pg/ml
Answer: B: Basal vasopressin level > 1 pg/ml 
Explanation: Ans: b. Basal vasopressin level > 1 pg/mlFailure to Produce ADH: "Central" Diabetes Insipidus.The treatment for central diabetes insipidus is administration of a synthetic analog of ADH, desmopressin, which acts selectively on V2 receptors to increase water permeability in the late distal and collecting tubules.Desmopressin can be given by injection, as a nasal spray, or orally, and it rapidly restores urine output toward normal.The polyuria anil polydipsia of nephrogenic DI are not affected by treatment *ith standard doses of DDAVP.