**Core Concept**
Multiple endocrine neoplasia-I (MEN-I) is a rare hereditary disorder characterized by the occurrence of tumors in multiple endocrine glands, including the parathyroid, pituitary, and pancreas. This condition is caused by mutations in the MEN1 gene, which encodes a tumor suppressor protein responsible for regulating cell growth and division.

**Why the Correct Answer is Right**
The correct answer is not directly involved in the pathophysiology of MEN-I. MEN-I primarily affects the parathyroid glands, leading to primary hyperparathyroidism, the pituitary gland, resulting in various pituitary hormone-secreting tumors, and the pancreas, causing pancreatic endocrine tumors. The pancreas is indeed involved in MEN-I, but the correct answer is not a characteristic feature of this condition.

**Why Each Wrong Option is Incorrect**
**Option A:** The parathyroid glands are indeed involved in MEN-I, leading to primary hyperparathyroidism. Therefore, this option is incorrect.
**Option B:** The pituitary gland is also a key endocrine gland affected in MEN-I, resulting in various pituitary hormone-secreting tumors. Thus, this option is incorrect.
**Option C:** The pancreas is involved in MEN-I, causing pancreatic endocrine tumors. Therefore, this option is incorrect.

**Clinical Pearl / High-Yield Fact**
MEN-I is a hereditary disorder that can be inherited in an autosomal dominant pattern, meaning a single copy of the mutated gene is sufficient to increase the risk of developing the condition.

**Correct Answer:** D.