**Core Concept**
Colles' fracture is a type of fracture that affects the distal end of the radius bone in the forearm, specifically at the wrist joint. This fracture typically occurs when a person falls onto an outstretched hand, causing the bone to break and leading to characteristic deformities.

**Why the Correct Answer is Right**
The Colles' fracture is characterized by a dorsal angulation of the distal fragment, resulting in a dinner fork deformity. This deformity occurs due to the displacement of the distal fragment in a dorsal (backward) direction, causing the wrist to appear abnormally curved and resembling a dinner fork. The mechanism of injury involves a fall onto an outstretched hand, leading to a hyperextension force that causes the fracture. The resulting deformity is often visible on X-ray and is a classic sign of Colles' fracture.

**Why Each Wrong Option is Incorrect**
**Option B:** Supracondylar fracture of Humerus does not result in a dinner fork deformity. Instead, it typically presents with a posterior or anterior displacement of the distal humerus, leading to different clinical and radiological features.

**Option C:** Smith's fracture is a type of fracture that affects the distal end of the radius, but it is characterized by a volar (forward) angulation of the distal fragment, not a dorsal angulation. This results in a different type of deformity, often referred to as a "garden spade" deformity.

**Option D:** Volar Barton Fracture is a type of fracture that affects the distal end of the radius, but it is characterized by a comminuted fracture of the distal fragment, often with a volar (forward) displacement. This does not typically result in a dinner fork deformity.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the dinner fork deformity is a classic sign of Colles' fracture, and it's often visible on X-ray. However, it's not the only type of fracture that can result in a similar deformity, so a thorough clinical and radiological evaluation is always necessary to make an accurate diagnosis.

**✓ Correct Answer: A. Colies fracture**