**Core Concept**
Osteoblastic metastasis is a type of bone metastasis characterized by the formation of new bone tissue, leading to increased bone density. This phenomenon is predominantly associated with tumors that produce substances that stimulate osteoblast activity.

**Why the Correct Answer is Right**
The correct answer is related to the tumor type that produces factors that stimulate osteoblasts, such as parathyroid hormone-related protein (PTHrP), prostaglandins, and growth factors like TGF-β. These substances promote the proliferation and activity of osteoblasts, resulting in the formation of new bone tissue. In the context of cancer, osteoblastic metastasis is often seen in tumors like prostate cancer, which produces PTHrP, leading to increased osteoblast activity.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as osteolytic metastasis is characterized by the destruction of bone tissue, typically seen in tumors like multiple myeloma and breast cancer.
**Option B:** This option is incorrect as osteosarcoma is a primary bone tumor that produces osteoid tissue, but it is not typically associated with osteoblastic metastasis.
**Option C:** This option is incorrect as renal cell carcinoma can produce osteolytic lesions, but it is not predominantly associated with osteoblastic metastasis.

**Clinical Pearl / High-Yield Fact**
It is essential to differentiate between osteolytic and osteoblastic metastasis, as these patterns can help identify the primary tumor type and guide appropriate management.

**Correct Answer:** D. Prostate cancer