Interferon acts against

Options

A. bacteria
B. fungus
C. virus
D. snake venom

Answer

### Step-by-Step Solution:

1. **Understanding Interferon**: Interferon is a type of signaling protein produced by the immune system in response to viral infections. It plays a crucial role in the body’s defense mechanism.

2. **Production of Interferon**: When the body detects a viral infection, white blood cells are activated and begin to produce interferons. This production is part of the immune response to combat the infection.

3. **Function of Interferon**: The primary function of interferons is to interfere with the replication of viruses. They do this by signaling neighboring cells to enhance their antiviral defenses, thereby restricting the multiplication of the virus.

4. **Mechanism of Action**: Interferons do not directly kill viruses or cancer cells. Instead, they boost the immune response and regulate the activity of genes that control the secretion of proteins affecting cell growth and immune responses.

5. **Conclusion**: Based on the above information, it can be concluded that interferons act primarily against viruses.

### Final Answer:
Interferon acts against viruses.

---