Suspension of attenuated pathogen that stimulates antibody formation is:

Options

A. Antitoxin
B. Antibiotic
C. Vaccine
D. Sera

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a term that describes a suspension of attenuated pathogens that stimulates the formation of antibodies in the body.

2. **Defining Attenuated Pathogens**: Attenuated pathogens are weakened or killed microorganisms. They are introduced into the body to provoke an immune response without causing the disease.

3. **Role of Attenuated Pathogens**: When these weakened pathogens are introduced into the body, they stimulate the immune system to produce antibodies. Antibodies are proteins that help the body fight off infections.

4. **Identifying the Correct Term**: The term that describes a suspension of these attenuated pathogens is known as a "vaccine." Vaccines are specifically designed to trigger an immune response and promote the production of antibodies.

5. **Eliminating Incorrect Options**:
- **Antitoxin**: This is a substance that neutralizes toxins but does not involve attenuated pathogens.
- **Antibiotic**: This refers to medications that kill or inhibit the growth of bacteria and does not involve the introduction of attenuated pathogens.
- **Sera**: This is a component of blood that does not involve the formation of antibodies from attenuated pathogens.

6. **Conclusion**: Based on the definitions and roles of the terms discussed, the correct answer to the question is "vaccine."

**Final Answer**: Vaccine

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