The substance produced by a cell in viral infection that can protect other cells from further infection is

Options

A. serotonin
B. colostrum
C. interferon
D. histamine

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question is asking for a specific substance that is produced by cells during a viral infection and has the ability to protect other cells from being infected by the virus.

2. **Identifying the Substance**: In the context of viral infections, the body has a defense mechanism that involves the production of signaling proteins. These proteins play a crucial role in the immune response.

3. **Recognizing Interferon**: The substance that fits this description is known as "interferon." Interferons are a group of signaling proteins that are produced by cells in response to viral infections.

4. **Function of Interferon**: Interferons help to protect neighboring healthy cells from viral infection by signaling them to enhance their antiviral defenses. This can include the activation of genes that inhibit viral replication.

5. **Conclusion**: Therefore, the correct answer to the question is "interferon."

**Final Answer**: Interferon

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