**Core Concept**
Wound contraction is a critical process in wound healing, characterized by the reduction in size of a wound due to the action of certain cells and tissues. This process is essential for limiting the size of a wound and promoting the healing process.

**Why the Correct Answer is Right**
Wound contraction is primarily mediated by myofibroblasts, which are specialized fibroblasts that possess the ability to contract and close wounds. Myofibroblasts produce and organize actin filaments, allowing them to generate contractile force, which ultimately leads to the closure of the wound. This process is facilitated by the presence of transforming growth factor-beta (TGF-β), which promotes the differentiation of fibroblasts into myofibroblasts.

**Why Each Wrong Option is Incorrect**
**Option A:** Macrophages play a crucial role in the inflammatory phase of wound healing but are not primarily responsible for wound contraction.
**Option B:** Lymphocytes are involved in the immune response and tissue repair but do not directly contribute to wound contraction.
**Option C:** Keratinocytes are responsible for the re-epithelialization of the wound but do not directly participate in wound contraction.

**Clinical Pearl / High-Yield Fact**
It's essential to note that excessive wound contraction can lead to contractures, which can result in limited joint mobility and functional impairment.

**Correct Answer:** C. Myofibroblasts.