Which amino acid among the following is non - essential ?

Options

A. Phenylalanine
B. Leucine
C. Tryptophan
D. Tyrosine

Answer

To determine which amino acid among the given options is non-essential, we can follow these steps:

### Step 1: Understand the definition of essential and non-essential amino acids
Essential amino acids are those that cannot be synthesized by the body and must be obtained through diet. Non-essential amino acids can be synthesized by the body.

### Step 2: List the given options
The options provided are:
- Phenylalanine
- Leucine
- Tryptophan
- Tyrosine

### Step 3: Identify which of the options are essential amino acids
From the knowledge of essential amino acids, we know that:
- Phenylalanine is essential.
- Leucine is essential.
- Tryptophan is essential.

### Step 4: Identify which of the options are non-essential amino acids
Tyrosine is classified as a non-essential amino acid because it can be synthesized in the body from phenylalanine.

### Step 5: Conclusion
Based on the classifications, the amino acid that is non-essential among the options provided is **Tyrosine**.

### Final Answer:
**Tyrosine**

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