What is the main difference between diabetic ketoacidosis(DKA) and hyperosmolar hyperglycemia syndrome (HHS)?

A. DKA always only occurs in patients with Type 2 diabetes is incorrect because DKA most commonly occurs in Type 1 diabetes due to absolute insulin deficiency. While it can rarely occur in Type 2 diabetes, it is not exclusive to this type. Patients with Type 2 diabetes usually retain some endogenous insulin, which prevents the severe ketosis seen in DKA. B. DKA is usually caused by acute illness, whereas HHS is not is incorrect because both DKA and HHS are often precipitated by acute illness, infection, surgery, or noncompliance with diabetes medications. The presence of a precipitating factor does not distinguish between the two syndromes. C. HHS does not require IV insulin, but DKA does is incorrect because both DKA and HHS may require IV insulin, particularly when glucose levels are high or hyperglycemia is not resolving with fluid replacement alone. In HHS, the primary focus is aggressive fluid resuscitation to correct severe dehydration, but insulin therapy is often necessary as well. D. In HHS, the body has enough insulin so ketoacidosis does not occur is correct. HHS patients typically have residual circulating insulin, which is sufficient to inhibit lipolysis and ketone production, preventing metabolic acidosis. In contrast, DKA occurs when insulin deficiency is severe or absolute, leading to uncontrolled fat breakdown, ketone accumulation, and metabolic acidosis. This explains why DKA presents with acidosis and ketonuria, while HHS presents with extreme hyperglycemia, profound dehydration, and little to no ketosis.