Here's a short story:

Cartilage is a resilient and smooth elastic tissue, rubber-like padding that covers and protects the ends of long bones at the joints, and is a structural component of the rib cage, the ear, the nose, the bronchial tubes, the intervertebral discs, and many other body components. It is not as hard and rigid as bone, but it is much stiffer and much less flexible than muscle. 

Because of its rigidity, cartilage often serves the purpose of holding tubes open in the body. Examples include the rings of the trachea, such as the cricoid cartilage and carina. 

Cartilage is composed of specialized cells called chondrocytes that produce a large amount of collagenous extracellular matrix, abundant ground substance that is rich in proteoglycan and elastin fibers. Cartilage is classified in three types, "elastic cartilage", "hyaline cartilage" and "fibrocartilage", which differ in relative amounts of collagen and proteoglycan. 

Cartilage does not contain blood vessels (it is avascular) or nerves (it is aneural). Nutrition is supplied to the chondrocytes by diffusion. The compression of the articular cartilage or flexion of the elastic cartilage generates fluid flow, which assists diffusion of nutrients to the chondrocytes. Compared to other connective tissues, cartilage has a very slow turnover of its extracellular matrix and does not repair. In embryogenesis, the skeletal system is derived from the mesoderm germ layer. Chondrification (also known as chondrogenesis) is the process by which cartilage is formed from condensed mesenchyme tissue, which differentiates into chondroblasts and begins secreting the molecules (aggrecan and collagen type II) that form the extracellular matrix. (End of story)

Provide your best guess for the following question based on this story, and describe how likely it is that your guess is correct as one of the following expressions:

Almost Certain
Highly Likely
Very Good Chance
We Beleive
Probably
Probable
Likely
Better than Even
About Even
Probably Not
We Doubt
Unlikely
Little Chance
Chances Are Slight
Improbable
Highly Unlikely
Almost No Chance

Give ONLY the guess and your confidence, no other words or explanation. For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>
Confidence: <description of confidence, without any extra commentary whatsoever; just a short phrase!>

Here are a few examples of questions and answers:

Question: What substance can cartilage be compared to?
Guess: other connective tissues
Confidence: <appropriate level of confidence in this guess>

Question: Is it flexible or rigid?
Guess: flexibl
Confidence: <appropriate level of confidence in this guess>

Question: Where is cartilage located in the body?
Guess: , the ear,
Confidence: <appropriate level of confidence in this guess>

Question: Anywhere else?
Guess: the rib cage
Confidence: <appropriate level of confidence in this guess>

Question: What is cartilage like compared to muscle?
Guess: stiffer
Confidence: <appropriate level of confidence in this guess>

Question: What kinds of cells is cartilage made up of?
Guess: specialized cells
Confidence: <appropriate level of confidence in this guess>

Question: What are they called?
Guess: chondrocytes
Confidence: <appropriate level of confidence in this guess>

Question: What do they produce?
Guess: matrix
Confidence: <appropriate level of confidence in this guess>

Question: How many types of cartilage are there?
Guess: three
Confidence: <appropriate level of confidence in this guess>

Question: How do they differ?
Guess: in relative amounts of collagen and proteoglycan
Confidence: <appropriate level of confidence in this guess>

Question: How do cartilage cells get nutrition?
Guess: diffusion
Confidence: <appropriate level of confidence in this guess>

Now answer the following question in the same format.

Question: How often does cartilage repair itself?

never