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Vaccines are

1. treated bacteria or viruses or one of their proteins
2. MHC (major histocompatibility complex) proteins
3. curative medicines
4. monoclonal antibodies

Correct answer: treated bacteria or viruses or one of their proteins

Solution

Vaccines contain weakened, killed, or partial forms of pathogens, or specific proteins from them, to stimulate an immune response without causing the disease. This helps the body build memory cells for faster protection later.

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