Final answer:
Patients with untreated Diabetes Insipidus report symptoms of polydipsia and polyuria, but do not experience hyperglycemia or sweet-tasting urine, which are associated with Diabetes mellitus, not Diabetes Insipidus.
Step-by-step explanation:
Diabetes Insipidus is a condition characterized by an abnormal increase in thirst, known as polydipsia, and an increase in urine output, known as polyuria. These symptoms occur due to a chronic underproduction of Antidiuretic Hormone (ADH) or a mutation in the ADH receptor, which impairs the kidney's ability to retain water, resulting in a significant loss of water through urine. Unlike Diabetes mellitus, Diabetes Insipidus does not involve high blood glucose levels, nor does it cause the urine to be sweet-tasting, as there is no glucose present in the urine. Therefore, patients with untreated Diabetes Insipidus do not report hyperglycemia or sweet-tasting urine.
The correct answer to the question is therefore (C) Sweet-tasting urine and (D) Hyperglycemia, as these are symptoms not reported by patients with untreated Diabetes Insipidus.