Amino acid tryptophan gives rise to

Options

A. Adrenaline
B. Melanin
C. Indole acetic acid
D. Thyroxine

Answer

To answer the question "Amino acid tryptophan gives rise to," we need to analyze the derivatives of tryptophan and identify which substances are produced from it.

### Step-by-Step Solution:

1. **Identify Tryptophan**: Tryptophan is an aromatic amino acid that is essential for protein synthesis and serves as a precursor for several important biomolecules.

2. **List Possible Derivatives**: The question mentions several substances: adrenaline, melanin, indole, acetic acid, and thyroxine. We need to determine which of these is derived from tryptophan.

3. **Analyze Each Substance**:
- **Adrenaline**: This hormone is produced from the amino acid tyrosine, not tryptophan.
- **Melanin**: Melanin is synthesized from the amino acid tyrosine as well, not tryptophan.
- **Indole**: Tryptophan can be converted into indole, which is a compound that has various biological roles.
- **Acetic Acid**: This is a simple carboxylic acid and is not derived from tryptophan.
- **Thyroxine**: This hormone is produced from the amino acid tyrosine and is not related to tryptophan.

4. **Identify the Correct Derivative**: Among the options provided, the most relevant derivative of tryptophan is **indole**. Tryptophan is a precursor to indole, which is further involved in the synthesis of indole-3-acetic acid, a plant hormone.

5. **Conclusion**: Therefore, the amino acid tryptophan gives rise primarily to **indole** and indirectly to indole-3-acetic acid, which is a plant hormone.

### Final Answer:
Amino acid tryptophan gives rise to **indole**.

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