Which of the following is an indispensable amino acid and contains sulphur?

Options

A. Phenylalanine
B. Valine
C. Lysine
D. Methionine

Answer

To determine which of the following amino acids is indispensable and contains sulfur, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Indispensable Amino Acids**:
- Indispensable amino acids, also known as essential amino acids, are those that the body cannot synthesize and must be obtained through the diet.

2. **List the Given Options**:
- The options provided are:
- A) Phenylalanine
- B) Valine
- C) Lysine
- D) Methionine

3. **Identify the Indispensable Amino Acids**:
- All four options (phenylalanine, valine, lysine, and methionine) are known to be essential amino acids.

4. **Check for Sulfur Content**:
- Now, we need to identify which of these amino acids contains sulfur.
- **Phenylalanine**: Does not contain sulfur.
- **Valine**: Does not contain sulfur.
- **Lysine**: Does not contain sulfur.
- **Methionine**: Contains sulfur in its structure.

5. **Conclusion**:
- Among the given options, methionine is the only indispensable amino acid that contains sulfur. Therefore, the correct answer is **D) Methionine**.