The correct response is Type 1 Diabetes or Type 2 Diabetes, depending on the context.
Type 1 Diabetes occurs when the pancreas does not produce enough insulin, while Type 2 Diabetes involves the body's inability to effectively use the insulin that is produced.
If you are looking for the specific condition in which insulin production is insufficient, Type 1 Diabetes would be a more direct answer. If the question refers more generally to insulin utilization issues, then Type 2 Diabetes could also apply.
If you need to choose just one option, you should select Type 1 Diabetes.