Assertion: Diabetes insipidus is marked by excessive urination and too much thirst of water.
Reason: Anti–diuretic hormone (ADH) is secreted by the posterior lobe of pituitary gland.
Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
Diabetes insipidus (DI) is a condition characterized by large amounts of dilute urine and increased thirst. The amount of urine produced can be nearly 20 liters per day. Reduction of fluid has little effect on the concentration of the urine. Complications may include dehydration or seizures
Central DI (CDI) is due to a lack of the hormone vasopressin (antidiuretic hormone). This can be due to damage to the hypothalamus or pituitary gland or genetics.