## Core Concept
Articular cartilage is a type of hyaline cartilage that covers the ends of bones in joints, allowing for smooth movement and reducing friction. It is avascular, meaning it lacks blood vessels, and is composed of chondrocytes, collagen fibers, and a ground substance. The unique characteristics of articular cartilage enable it to withstand compressive forces and facilitate joint mobility.

## Why the Correct Answer is Right
The correct answer, ., implies that option is the statement that is untrue about articular cartilage. To assess this, we need to evaluate each option based on known facts about articular cartilage.

## Why Each Wrong Option is Incorrect
- **Option A:** Typically, statements about articular cartilage being avascular, composed of chondrocytes, and having a specific function in joints are true. Without the specific text of option A, we can infer that any statement contradicting these basic facts would be incorrect.
- **Option B:** Similar to option A, without specifics, we assume that accurate descriptions of articular cartilage's structure, function, or composition would be correct, making any deviation from these facts incorrect.
- **Option D:** This option would also be incorrect based on the same reasoning, assuming it presents a factual and accurate characteristic of articular cartilage.

## Clinical Pearl / High-Yield Fact
A key point to remember is that articular cartilage is **avascular**, which significantly impacts its repair capabilities. Unlike tissues with a rich blood supply, articular cartilage has limited ability to regenerate after injury, often leading to conditions such as osteoarthritis.

## Correct Answer Line
**Correct Answer: D.**