**Core Concept**
Bone tumors arising from epiphyses are a type of primary bone tumor that originates from the growth plate, which is the cartilaginous area adjacent to the metaphysis. These tumors are typically seen in children and adolescents, and their growth pattern is closely related to the growth plate's activity.

**Why the Correct Answer is Right**
The correct answer is a type of bone tumor that is known to arise from the epiphyses, or the ends of long bones. These tumors are often benign, but can be locally aggressive and may cause bone deformity. The growth plate, or epiphyseal plate, is a highly cellular and metabolically active region, making it a common site for tumor development. The most common tumor type that arises from the epiphyses is the **Chondroblastoma**.

**Why Each Wrong Option is Incorrect**
**Option A:** Osteosarcoma is a malignant bone tumor that typically arises from the metaphysis, not the epiphysis.
**Option B:** Ewing's sarcoma is a malignant bone tumor that can arise from any bone, but it is more commonly seen in the diaphysis or metaphysis, not the epiphysis.
**Option C:** Giant cell tumor is a benign bone tumor that typically arises from the epiphysis, but it is more commonly seen in adults, not children and adolescents.

**Clinical Pearl / High-Yield Fact**
Remember that bone tumors arising from the epiphyses are often benign and may cause bone deformity due to their growth pattern, which is closely related to the growth plate's activity.

**Correct Answer:** C. Giant cell tumor