**Core Concept**
The process of wound healing involves complex interactions between various cell types, growth factors, and the extracellular matrix to restore tissue integrity and function. Wound healing can be broadly classified into three phases: inflammatory, proliferative, and remodeling. The type of wound healing (primary or secondary intention) depends on the depth and location of the wound.

**Why the Correct Answer is Right**
Deep dermal wounds involve damage to the dermal layer of the skin, which contains a rich network of collagen fibers and blood vessels. In such cases, the wound healing process involves scar formation as the body attempts to restore the lost tissue structure and function. Scar formation is characterized by the deposition of new collagen fibers, which provides mechanical strength to the wound site. This process is essential for deep dermal wounds, as it helps to restore the skin's integrity and prevent further complications.

**Why Each Wrong Option is Incorrect**
**Option A:** Infected wounds typically heal by secondary intention, as the presence of infection delays the wound healing process and leads to a prolonged inflammatory phase.
**Option C:** Wound contraction is actually a characteristic feature of healing by secondary intention, where the edges of the wound are drawn together by the action of fibroblasts and myofibroblasts.
**Option D:** In contrast to secondary intention, primary intention wound healing is characterized by a less intense inflammatory response, as the wound edges are closely opposed and the risk of infection is lower.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the type of wound healing can significantly impact the final outcome, with primary intention wounds typically resulting in minimal scarring and deep dermal wounds healing with noticeable scarring.

✓ Correct Answer: B. Deep dermal wound heal by scar formation