**Core Concept**
Articular cartilage is a type of connective tissue that covers the ends of bones in joints, providing a smooth, frictionless surface for joint movement. It is composed of a specialized matrix that contains various types of collagen, which provide tensile strength and elasticity.

**Why the Correct Answer is Right**
Articular cartilage is primarily composed of type II collagen, which is a unique fibrillar collagen that forms a network of fibers. This type of collagen is particularly well-suited for withstanding compressive forces and providing flexibility to the cartilage. Type II collagen is also rich in glycosaminoglycans, such as aggrecan, which contribute to the cartilage's high water content and compressive resistance. The presence of type II collagen is a key characteristic of articular cartilage, distinguishing it from other types of connective tissue.

**Why Each Wrong Option is Incorrect**
**Option A:** Type I collagen is a major component of skin, bone, and tendon, but it is not the primary type of collagen found in articular cartilage. Type I collagen has a different structure and function compared to type II collagen.
**Option C:** Type III collagen is a reticular collagen found in blood vessels, lymphatic vessels, and other tissues, but it is not a major component of articular cartilage.
**Option D:** Type IV collagen is a component of basal lamina, a layer of extracellular matrix that separates epithelial cells from the underlying connective tissue, but it is not a primary component of articular cartilage.

**Clinical Pearl / High-Yield Fact**
It's essential to note that articular cartilage has a limited capacity for repair and regeneration, making injuries to this tissue challenging to treat. Degradation of type II collagen is a hallmark of osteoarthritis, a common joint disorder characterized by cartilage breakdown and inflammation.

✓ Correct Answer: B. Type II collagen