**Core Concept**
Lesions in the epiphysis are crucial to identify because they can lead to growth disturbances in long bones. The epiphysis is the rounded end of a long bone, which is initially separated from the metaphysis (the wider part of the bone adjacent to the epiphysis) by a growth plate and eventually fuses with it.

**Why the Correct Answer is Right**
The correct answer is a lesion that affects the growth plate or the epiphysis itself. A Salter-Harris classification of type I injury occurs when there is a fracture through the growth plate, which can lead to premature closure of the growth plate and subsequent growth disturbances. This type of injury typically occurs in adolescents.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because a Jones fracture is a type of stress fracture that occurs in the proximal fifth metatarsal bone, not an epiphyseal lesion.
* **Option B:** This option is incorrect because a Greenstick fracture is a type of incomplete fracture that typically occurs in children, but it is not an epiphyseal lesion.
* **Option C:** This option is incorrect because a Perthes disease is an idiopathic form of osteonecrosis of the femoral head, not an epiphyseal lesion.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that growth disturbances can lead to significant morbidity, including limb-length discrepancies and angular deformities.

**Correct Answer:** C.