A 7-year-old dog presents with polyuria, polydipsia, and a urine specific gravity of 1.008. Serum chemistry reveals hypernatremia and hyperosmolality. Which test best differentiates central from nephrogenic diabetes insipidus?
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A
ACTH stimulation test
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B
Modified water deprivation test followed by desmopressin administration
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C
Urine cortisol:creatinine ratio
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D
Low-dose dexamethasone suppression test