## Core Concept
Chitin is a long-chain polymer of a N-acetylglucosamine, a derivative of glucose. It is a primary component of cell walls in fungi, exoskeletons of arthropods, and in some organisms, it forms a structural polysaccharide. The question pertains to the type of bond that holds chitin together.

## Why the Correct Answer is Right
Chitin is a polysaccharide composed of N-acetylglucosamine units linked together by **β-1,4-glycosidic bonds**. These bonds are a type of covalent bond that connects the carbon atoms of two sugar molecules, forming a long-chain polymer. This structural characteristic is crucial for the rigidity and strength of chitin in its biological roles.

## Why Each Wrong Option is Incorrect
- **Option A:** If another type of glycosidic bond (e.g., α-1,4-glycosidic) were correct, it would imply a different polysaccharide structure, not chitin.
- **Option B:** Hydrogen bonds are important for the secondary structure of polysaccharides but are not what primarily hold the chitin polymer together.
- **Option C:** Peptide bonds are relevant to proteins, not polysaccharides like chitin.

## Clinical Pearl / High-Yield Fact
A memorable point is that chitin's structure, held together by **β-1,4-glycosidic bonds**, is similar to that of cellulose in plants but differs in its N-acetylglucosamine units. This distinction is crucial for understanding the diverse roles of polysaccharides in biology.

## Correct Answer: B. β-1,4-glycosidic bonds