The elementary sulphur is present in

Options

A. Valine , lysine and cystine
B. Tryptophan , Glutamic acid , Aspartic acid
C. Citrulline , Methionine and Glutamic acid
D. Homo-cysteine , Cystine and Methionine

Answer

To determine which amino acids contain elementary sulfur, we will analyze the given options systematically.

### Step-by-Step Solution:

1. **Identify the Amino Acids**: The question provides four options, each containing different amino acids. We need to check each amino acid for the presence of sulfur.

2. **Analyze Each Option**:
- **Option A**: Valine, Lysine, Cysteine
- **Valine**: Structure - CH(CH3)2. No sulfur present.
- **Lysine**: Structure - (CH2)4NH2. No sulfur present.
- **Cysteine**: Structure - CH2SH. Contains sulfur (SH group).
- Conclusion: Contains one amino acid with sulfur (Cysteine).

- **Option B**: Tryptophan, Glutamic Acid, Aspartic Acid
- **Tryptophan**: Structure - C11H12N2O2. No sulfur present.
- **Glutamic Acid**: Structure - CH2CH2(COOH)2. No sulfur present.
- **Aspartic Acid**: Structure - CH2(COOH)2. No sulfur present.
- Conclusion: No amino acids with sulfur.

- **Option C**: Citrulline, Methionine, Glutamic Acid
- **Citrulline**: Structure - C6H13N3O3. No sulfur present.
- **Methionine**: Structure - CH2CH2(CH3)S. Contains sulfur (thioether group).
- **Glutamic Acid**: Already analyzed, no sulfur present.
- Conclusion: Contains one amino acid with sulfur (Methionine).

- **Option D**: Homocysteine, Cysteine, Methionine
- **Homocysteine**: Structure - CH2CH2SH. Contains sulfur.
- **Cysteine**: Already analyzed, contains sulfur.
- **Methionine**: Already analyzed, contains sulfur.
- Conclusion: All three amino acids contain sulfur.

3. **Final Conclusion**: The option that contains amino acids with elementary sulfur is **Option D: Homocysteine, Cysteine, and Methionine**.

### Answer:
**Option D: Homocysteine, Cysteine, and Methionine** contains elementary sulfur.