Which of the following is produced by genetically-enineered bacteria ?

Options

A. Thyroxine
B. Insulin
C. Glucagon
D. ADH

Explanation

To solve the question "Which of the following is produced by genetically-engineered bacteria?" we will analyze the given options and determine which one is correct based on the information provided.

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for a product that is specifically produced by genetically-engineered bacteria. We need to identify which of the options listed is synthesized using genetic engineering techniques.

2. **Review the Options**:
- A. Thyroxin
- B. Insulin
- C. Glucagon
- D. TADH

3. **Analyze Each Option**:
- **Thyroxin**: This is a hormone produced by the thyroid gland and is not produced by genetically-engineered bacteria.
- **Insulin**: Insulin is a hormone that regulates blood sugar levels. It was traditionally extracted from animal pancreases but is now produced using genetically-engineered bacteria, specifically E. coli, through recombinant DNA technology.
- **Glucagon**: This hormone is produced by the alpha cells of the pancreas and is not produced by genetically-engineered bacteria.
- **TADH (presumably referring to TADH or TADH2)**: There is no clear reference to this as a product of genetically-engineered bacteria.

4. **Identify the Correct Answer**: Based on the analysis, the only option that is produced by genetically-engineered bacteria is **B. Insulin**.

5. **Conclusion**: Therefore, the answer to the question is **Insulin**.

### Final Answer:
**B. Insulin**

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