**Core Concept**
Calcification of soft tissues without any disturbance of calcium metabolism is a specific phenomenon that occurs due to the deposition of calcium salts in the absence of abnormalities in calcium homeostasis. This process is distinct from conditions like hyperparathyroidism or osteogenesis imperfecta, where calcium metabolism is disrupted.

**Why the Correct Answer is Right**
The correct answer is related to the concept of dystrophic calcification. Dystrophic calcification occurs in damaged or necrotic tissue, where there is an imbalance between the deposition and dissolution of calcium and phosphate ions. This leads to the formation of calcium phosphate crystals, which accumulate and cause calcification. Dystrophic calcification is often seen in conditions like myocardial infarction, muscle injury, or in the setting of renal failure.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not accurately describe the phenomenon of calcification in soft tissues without disturbance of calcium metabolism. Dystrophic calcification is a more specific term that describes this process.
* **Option B:** This option is incorrect because it refers to metastatic calcification, which occurs in the presence of abnormal calcium metabolism, such as in hyperparathyroidism or vitamin D toxicity.
* **Option C:** This option is incorrect because it refers to idiopathic calcification, which is a non-specific term that does not accurately describe the phenomenon of calcification in soft tissues without disturbance of calcium metabolism.
* **Option D:** This option is incorrect because it is a vague term that could refer to any type of calcification, without specifying the absence of disturbance in calcium metabolism.

**Clinical Pearl / High-Yield Fact**
Dystrophic calcification is often seen in areas with poor blood supply, such as in the heart after a myocardial infarction. This is because the damaged tissue has an imbalance between the deposition and dissolution of calcium and phosphate ions, leading to calcification.

**Correct Answer:** A. Dystrophic calcification.