Which type of diabetes is said to be caused by another condition or event?

The correct response is secondary diabetes mellitus because this type of diabetes is characterized by its occurrence as a result of another underlying condition or event. Secondary diabetes can be triggered by numerous factors, such as pancreatic disease, hormonal disorders, or certain medications.

In contrast, Type 1 diabetes is primarily an autoimmune condition where the body attacks insulin-producing cells in the pancreas. Type 2 diabetes is often associated with lifestyle factors and is characterized by insulin resistance rather than being caused by another condition. Gestational diabetes occurs during pregnancy due to hormonal changes and usually resolves after childbirth, but it is not classified as secondary diabetes since it is distinct and not caused by another underlying health issue.

Therefore, secondary diabetes mellitus directly results from other health complications, making it the correct answer in this context.