## **Core Concept**
The question tests knowledge of the chemical structure of specific drugs, focusing on the presence of amino groups in their side chains. This is relevant to understanding the pharmacological properties and classifications of these drugs.

## **Why the Correct Answer is Right**
The correct answer, **Lysine**, is an amino acid with an additional amino group in its side chain, making it a dibasic amino acid. This unique structure allows it to have two amino groups.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option does not correspond to a compound known for having two amino groups in its side chain.
- **Option B:** Similarly, this option does not match a compound with the specified structural feature.
- **Option C:** This is not relevant to the structural characteristic in question.

## **Clinical Pearl / High-Yield Fact**
Amino acids like **Lysine** are crucial for various bodily functions, including protein synthesis. Lysine's additional amino group makes it important for cross-linking collagen and elastin.

## **Correct Answer:** . Lysine