**Core Concept**
Metastatic calcification is a type of calcification that occurs in otherwise normal tissues due to elevated levels of calcium in the blood, often as a result of hypercalcemia. This condition can be caused by various factors, including hyperparathyroidism, vitamin D intoxication, or malignancies that produce parathyroid hormone-related protein (PTHrP).

**Why the Correct Answer is Right**
The correct answer is associated with hypercalcemia, which can be caused by excessive production of parathyroid hormone (PTH) or PTHrP. Elevated levels of PTH or PTHrP lead to increased absorption of calcium from the intestine, increased release of calcium from bones, and decreased excretion of calcium by the kidneys, resulting in hypercalcemia. Metastatic calcification occurs when the high calcium levels in the blood deposit in tissues, leading to the formation of calcium salts.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not typically associated with metastatic calcification. Instead, dystrophic calcification is more commonly seen in damaged or necrotic tissues.
**Option B:** This option is not a direct cause of metastatic calcification. While certain medications can cause hypercalcemia, they are not the primary cause of metastatic calcification.
**Option C:** This option is not a primary cause of metastatic calcification. While certain diseases, such as sarcoidosis, can cause hypercalcemia, they are not the most common causes of metastatic calcification.

**Clinical Pearl / High-Yield Fact**
Metastatic calcification can occur in various tissues, including the lungs, kidneys, and blood vessels. It is often seen in patients with hyperparathyroidism or malignancies that produce PTHrP.

**Correct Answer: C. Hyperparathyroidism.**