system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
In a patient if administration of exogeneus vasopressin does not increase the osmolality of urine the likely cause is
assistant
The correct answer is  Answer is C (Renal Hyposensitivity to ADH): Failure of urine osmolality to rise even after administration of exogenous ADH/vasopressin suggests a diagnosis of Nephrogenic Diabetes Insipidus due resistance to action of vasopressin on the Renal tubule (Renal Hyposensitivity to ADH).