True about Type I diabetes melitus is ?
**Core Concept**
Type I diabetes mellitus is an autoimmune disease characterized by the destruction of pancreatic beta cells, leading to absolute insulin deficiency and hyperglycemia. The pathogenesis involves a complex interplay between genetic predisposition, environmental triggers, and immune system dysregulation.
**Why the Correct Answer is Right**
In Type I diabetes, the immune system mistakenly attacks and destroys the insulin-producing beta cells in the islets of Langerhans of the pancreas. This results in a complete deficiency of insulin production, requiring exogenous insulin therapy for glucose regulation. The autoimmune destruction of beta cells is mediated by autoreactive T cells and antibodies against pancreatic antigens, such as glutamic acid decarboxylase (GAD) and insulin.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Type I diabetes is primarily an autoimmune disease, not a result of insulin resistance or peripheral insulin deficiency.
**Option B:** This option is incorrect because Type I diabetes is characterized by absolute insulin deficiency, not impaired insulin secretion or insulin resistance.
**Option C:** This option is incorrect because Type II diabetes is primarily associated with insulin resistance and impaired insulin secretion, not autoimmune destruction of beta cells.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that Type I diabetes typically presents in children and young adults, often with symptoms of diabetic ketoacidosis (DKA), whereas Type II diabetes is more common in older adults and is often associated with obesity, hypertension, and hyperlipidemia.
**Correct Answer:** D. This option is incorrect because the question asked for a statement about Type I diabetes mellitus. However, since the question is incomplete, I will provide a common fact about Type I diabetes mellitus: Type I diabetes is often associated with other autoimmune diseases, such as thyroiditis and celiac disease.