Assertion : Interferons are a type of antibodies produced by body cells infected by bacteria.
Reason : Interferons stimulate inflammation at the site of injury.

Options

A. If both A and R are true and R is the correct explanation of A
B. If both A and R are true but R is not the correct explanation of A
C. If A is true and R is false
D. If both A and R are false

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Interferons are a type of antibodies produced by body cells infected by bacteria."
- To evaluate this, we need to know what interferons are. Interferons are not antibodies; they are glycoproteins produced by cells in response to viral infections, not bacterial infections.

2. **Understanding the Reason**:
- The reason states that "Interferons stimulate inflammation at the site of injury."
- While interferons do play a role in the immune response, they are primarily involved in antiviral defense rather than directly stimulating inflammation. Inflammation is typically a response to injury or infection, but interferons specifically act to signal neighboring cells to enhance their antiviral defenses.

3. **Evaluating the Truth of Each Statement**:
- The assertion is false because interferons are not antibodies and are produced by virus-infected cells, not bacteria-infected cells.
- The reason is also false because interferons do not primarily stimulate inflammation; they are involved in the antiviral response.

4. **Conclusion**:
- Since both the assertion and the reason are false, the correct answer is that both statements are false.

### Final Answer:
Both the assertion and reason are false.