**Core Concept**
A Thomas splint is a type of orthopedic splint used for immobilizing and stabilizing fractures, particularly in the lower limb. It is a traction splint designed to apply gentle, continuous traction to the affected limb, promoting proper alignment and healing of the fracture site.

**Why the Correct Answer is Right**
The Thomas splint is specifically designed for immobilizing hip fractures, such as those occurring in the femoral neck or intertrochanteric region. The splint works by applying traction to the affected limb, which helps to realign the bone fragments and promote healing. This is particularly useful in cases where the patient is unable to bear weight on the affected leg or requires stabilization to facilitate surgical intervention.

**Why Each Wrong Option is Incorrect**
**Option A:** The Buck's extension splint is used for immobilizing fractures of the forearm, not hip fractures.
**Option B:** The Garden's splint is not a recognized orthopedic splint; it's possible this option was meant to be the correct answer, but it's not a valid option.
**Option C:** The Hibb's traction is used for immobilizing fractures of the femur, but it's not a splint, rather a form of skeletal traction.

**Clinical Pearl / High-Yield Fact**
When using a Thomas splint, it's essential to apply gentle, continuous traction to avoid further injury to the surrounding soft tissues. This can be achieved by adjusting the splint's tension and ensuring proper alignment of the affected limb.

**Correct Answer: C.**