Which type of Diabetes has normal blood glucose levels and presents with severe thirst due to a lack of ADH?

The condition described in the question is characterized by normal blood glucose levels and presents with severe thirst due to a lack of antidiuretic hormone (ADH), which aligns with diabetes insipidus. In diabetes insipidus, the body fails to properly concentrate urine because of insufficient production of ADH, which leads to excessive urination and consequent dehydration. As a result, individuals experience intense thirst as the body attempts to maintain hydration.

In contrast, type 1 and type 2 diabetes are both forms of diabetes mellitus, which primarily involve elevated blood glucose levels due to insulin deficiency or insulin resistance. Gestational diabetes occurs during pregnancy and also involves abnormal glucose regulation, leading to elevated blood sugar levels.

Diabetes insipidus is distinct from these other forms of diabetes, primarily because it does not involve glucose metabolism but rather a problem with water balance and ADH. Therefore, the correct answer emphasizes the unique mechanism in diabetes insipidus and its symptoms, making it the right choice for this question.