**Core Concept**
Chondrosarcoma is a malignant tumor of cartilaginous origin that can affect various bones, including those in the facial region. In the context of maxillary and mandibular involvement, chondrosarcoma is notable for its relatively equal propensity to affect both bones.

**Why the Correct Answer is Right**
Chondrosarcoma arises from cartilage cells and tends to occur in the metaphyseal regions of long bones, including those in the facial skeleton. The equal involvement of the maxilla and mandible in chondrosarcoma can be attributed to the presence of cartilage in both bones, particularly in the articular surfaces and the temporomandibular joint. This characteristic makes chondrosarcoma stand out among other sarcomas, which tend to have a predilection for specific bones or locations.

**Why Each Wrong Option is Incorrect**
**Option A:** Fibrosarcoma is a malignant tumor of fibroblasts and tends to occur in the soft tissues, including the skin and subcutaneous tissue. It is less likely to involve the maxilla and mandible equally.

**Option B:** Osteosarcoma is a malignant tumor of osteoid-producing cells and tends to occur in the metaphyseal regions of long bones, particularly in the distal femur and proximal tibia. It has a higher propensity for the mandible than the maxilla.

**Option C:** Ewing’s sarcoma is a malignant tumor of neuroectodermal origin and tends to occur in the diaphyseal regions of long bones, particularly in the pelvis, femur, and tibia. It is less likely to involve the maxilla and mandible equally.

**Clinical Pearl / High-Yield Fact**
When considering sarcomas that affect the facial bones, it is essential to remember that chondrosarcoma is a significant differential diagnosis, particularly in patients with a history of radiation exposure or a known genetic predisposition.

**✓ Correct Answer: D. Chondrosarcoma**