**Core Concept**
Benign tumors are composed of non-cancerous cells that do not invade surrounding tissues or metastasize. They can still cause problems due to their size or location, but they typically have a good prognosis and can be easily removed. Examples of benign tumors include lipomas, osteomas, and fibromas.

**Why the Correct Answer is Right**
The correct answer is a type of tumor that is characterized by its malignant potential and ability to invade surrounding tissues. This contrasts with benign tumors, which are non-cancerous and do not invade. The correct answer is a type of tumor that is known for its aggressive behavior and poor prognosis.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is a type of benign tumor that is commonly found in the skin and soft tissues. It is characterized by its slow growth and non-aggressive behavior.
**Option B:** This option is a type of tumor that is typically benign, although it can be malignant in rare cases. It is characterized by its growth in the bone and its ability to cause pain and deformity.
**Option C:** This option is a type of benign tumor that is commonly found in the skin and soft tissues. It is characterized by its slow growth and non-aggressive behavior.

**Clinical Pearl / High-Yield Fact**
When differentiating between benign and malignant tumors, it is essential to consider the tumor's growth pattern, location, and histological features. A tumor that invades surrounding tissues or has a high mitotic rate is more likely to be malignant.

**Correct Answer: D. Malignant tumor such as osteosarcoma.**