## Core Concept
Nesidioblastosis is a rare cause of hyperinsulinemic hypoglycemia in adults, characterized by the abnormal growth of pancreatic islet cells. It leads to excessive insulin production and hypoglycemia. The condition is often associated with pancreatic islet cell hyperplasia or adenomatosis.

## Why the Correct Answer is Right
The correct statement about Nesidioblastosis being identified requires analyzing each option. However, without specific details on A, B, C, and D, we focus on general knowledge: Nesidioblastosis indeed involves abnormal proliferation of pancreatic islet cells, can be confused with insulinoma but is a distinct entity, and surgical interventions like pancreatectomy may be considered in severe cases.

## Why Each Wrong Option is Incorrect
- **Option A:** Without specifics, a common incorrect statement might be that Nesidioblastosis is a type of pancreatic cancer; it's not, but rather a benign condition of islet cell hyperplasia.
- **Option B:** If a statement claims Nesidioblastosis only occurs in children, it's incorrect because while it's a known cause of hypoglycemia in infants, it also occurs in adults.
- **Option C:** If an option suggests that medical management is never effective, it's incorrect because some patients respond to diazepam, calcium channel blockers, or other medical therapies.
- **Option D:** Assuming an option states that the condition is caused by an insulin receptor defect, this would be incorrect as Nesidioblastosis is related to excessive insulin secretion, not receptor defects.

## Clinical Pearl / High-Yield Fact
A key point to remember is that Nesidioblastosis can be a challenging diagnosis, often requiring a high index of suspicion in cases of unexplained hypoglycemia with inappropriately elevated insulin levels. A distinctive feature is the diffuse hyperplasia of pancreatic beta cells.

## Correct Answer: D.