## Core Concept
Giant cell tumors (GCTs) are typically benign but locally aggressive neoplasms that often occur in the epiphyseal ends of long bones, particularly around the knee. They are characterized by the presence of multinucleated giant cells. The treatment and behavior of GCTs can vary based on their location and aggressiveness.

## Why the Correct Answer is Right
The statement regarding the location and characteristics of GCTs being most commonly found in the epiphyseal ends of long bones, especially around the knee, and their nature of being locally aggressive but generally benign, guides us toward understanding which statement might not be true. GCTs are known for their potential to cause bone destruction and can have a high rate of recurrence if not adequately treated.

## Why Each Wrong Option is Incorrect
- **Option A:** Without specific details on option A, we cannot directly address its inaccuracies regarding GCTs. However, any statement contradicting the known facts about GCTs, such as their typical locations (e.g., distal femur, proximal tibia, distal radius), would be incorrect.
- **Option B:** Similarly, without specifics, if option B misrepresents the biological behavior of GCTs (e.g., suggesting they are highly malignant, which is not typically the case), it would be incorrect.
- **Option C:** If option C inaccurately describes a treatment approach or a characteristic feature of GCTs (e.g., suggesting they are not locally aggressive), it would be incorrect.
- **Option D:** This option is noted as the correct answer but without details provided in the question, we infer based on common misconceptions about GCTs.

## Clinical Pearl / High-Yield Fact
A key point to remember about GCTs is that they are often classified into three grades based on their aggressiveness: latent (Grade 1), active (Grade 2), and aggressive (Grade 3). The treatment can range from curettage to wide resection or even the use of adjuvant therapies to reduce recurrence rates.

## Correct Answer: D.