Final answer:
The cause of Type I Diabetes Mellitus is Beta Cell Destruction. It is an autoimmune disease where the body's immune system attacks the beta cells in the pancreas, which produce insulin.
Step-by-step explanation:
Type 1 Diabetes Mellitus
The cause of Type I Diabetes Mellitus (DM) is D. Beta Cell Destruction. Type 1 diabetes is a chronic autoimmune disorder where the immune system erroneously attacks and destroys the insulin-producing beta cells in the pancreas. Due to the destruction of these cells, the pancreas fails to produce sufficient insulin, which is essential for regulating blood glucose levels. Such destruction may be influenced by genetic susceptibility, autoimmune antibodies, or environmental factors, such as viral infections. In contrast, Type 2 diabetes is commonly associated with insulin resistance, where cells become less responsive to insulin, not a lack of insulin production.