In type I diabetes, which of the following is true:-
**Core Concept**
Type I diabetes is characterized by absolute insulin deficiency due to autoimmune destruction of pancreatic beta cells, leading to hyperglycemia and ketosis. The body's inability to produce insulin results in impaired glucose uptake by cells, causing elevated blood glucose levels.
**Why the Correct Answer is Right**
Insulin is a hormone produced by the beta cells of the islets of Langerhans in the pancreas. In type I diabetes, the autoimmune response destroys these beta cells, leading to a complete lack of insulin production. This results in hyperglycemia and the inability to regulate glucose levels in the blood. The body's reliance on glucose for energy is impaired, and alternative sources of energy, such as ketones, are utilized instead.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided.
* **Option B:** This option is not provided.
* **Option C:** This option is not provided.
**Clinical Pearl / High-Yield Fact**
It's essential to note that type I diabetes is often diagnosed in young people, typically before the age of 20, and is characterized by a rapid onset of symptoms. Early recognition and treatment are crucial to prevent long-term complications.
**Correct Answer: A. Insulin deficiency.**