An intermediate of adrenaline biosynthesis which is also a neurotransmitter is

Options

A. Glycine
B. Gama-aminobutyric acid
C. Dopamine
D. Glutamic acid.

Answer

To solve the question regarding the intermediate of adrenaline biosynthesis that is also a neurotransmitter, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**: The question asks for an intermediate in the biosynthesis of adrenaline (also known as epinephrine) that also functions as a neurotransmitter.

2. **Know the Biosynthesis Pathway**: Adrenaline is synthesized from noradrenaline (norepinephrine), which itself is derived from the amino acid tyrosine. The pathway is as follows:
- Tyrosine → L-DOPA → Dopamine → Noradrenaline → Adrenaline.

3. **Identify the Intermediate**: In the biosynthetic pathway, dopamine is formed from L-DOPA and is the direct precursor to noradrenaline. Therefore, dopamine is an intermediate in the synthesis of adrenaline.

4. **Check the Neurotransmitter Function**: Dopamine is well-known to function as a neurotransmitter in the brain, playing a crucial role in reward, motivation, and motor control.

5. **Evaluate the Options**: The options provided are:
- Glycine
- Gamma-aminobutyric acid (GABA)
- Dopamine
- Glutamic acid

Among these, dopamine is the only one that fits both criteria: it is an intermediate in the biosynthesis of adrenaline and also serves as a neurotransmitter.

6. **Conclude the Answer**: Therefore, the correct answer to the question is **Dopamine**.

### Final Answer:
The intermediate of adrenaline biosynthesis which is also a neurotransmitter is **Dopamine**.