A 54-year-old man undergoes laparoscopic hernia repair. In spite of the small size of the incisions, he has poor wound healing. Further history reveals that his usual diet has poor nutritional value and is deficient in vitamin C. Synthesis of which of the following extracellular matrix components is most affected by this deficiency?

**Core Concept**
The question highlights the importance of nutritional factors in wound healing, specifically the role of vitamin C in the synthesis of extracellular matrix components. Vitamin C is a crucial cofactor for the enzyme prolyl hydroxylase, which is essential for the stabilization of collagen fibers.

**Why the Correct Answer is Right**
Vitamin C deficiency impairs the synthesis of collagen, a key component of the extracellular matrix. Collagen provides strength and structure to tissues, including wound healing sites. The prolyl hydroxylase enzyme requires vitamin C as a cofactor to convert proline and lysine residues into hydroxyproline and hydroxylysine, which are essential for collagen cross-linking. Without sufficient vitamin C, collagen synthesis is disrupted, leading to poor wound healing.

**Why Each Wrong Option is Incorrect**
* **Option A:** Glycosaminoglycans (GAGs) are important components of the extracellular matrix, but their synthesis is not directly affected by vitamin C deficiency.
* **Option B:** Elastin is another protein component of the extracellular matrix, but its synthesis is not as directly dependent on vitamin C as collagen synthesis is.
* **Option D:** Fibrin is a protein involved in blood clotting, but its synthesis is not directly related to vitamin C deficiency.

**Clinical Pearl / High-Yield Fact**
Vitamin C deficiency can lead to scurvy, a condition characterized by poor wound healing, bleeding gums, and joint pain. It is essential to maintain adequate vitamin C levels, especially in patients undergoing surgery or with poor nutritional status.

**Correct Answer:** C. Collagen.

✓ Correct Answer: A. Collagen