Diabetes occurs when there is a large amount of sugar in the blood. which gland is most likely not functioning well enough in a person who has diabetes?

pituitary
thyroid
pancreas
adrenal

The pancreas regulates blood sugar, glucose within the body. 

Sorry to get back so late to your request.

The answer is the "Pancrease"

Insulin is the primary organ that regulates your Glucose levels (actually liver can also add glucose into the blood stream). In diabetes however the production of insulin is inhibited. Insulin unlock the energy within glucose so a cell can use. Diabetes comes in several forms (Type 1 where the body can produce insulin, and Type 2 where the body has become resistant or production of insulin has been diminished.

The correct answer is: making up measurement to record