Question at position 72 Which of the following is true about most vaccines?The antigen in a vaccine induces the recipient to produce antibodyThe antibody in a vaccine induces the recipient to produce antigenThey only have one ingredientNone of the aboveClear my selection

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BlackTom AI · Accepted Answer

To begin, let's restate the question and options to ensure clarity about what is being assessed: The question asks which statement is true about most vaccines.
Option 1: "The antigen in a vaccine induces the recipient to produce antibody". This aligns with the fundamental immunology of vaccines: exposure to an antigen prompts the immune system to generate antibodies and memory cells, enabling a quicker response if the real pathogen is encountered later. This is the core mechanism by which vaccines confer protection.
Option 2: "The antibody in a vaccine induces the recipient to produce antigen". This reverses the causal direction. Antibodies do not induce production of antigen; rather, antigens stimulate antibody production. So this statement is incorrect because it confuses cause and effect in the immune response.
Option 3: "They only have one ingredient". In reality, vaccines typically contain multiple ingredients besides the antigen, such as adjuvants, stabilizers, preservatives, and sometimes trace components. Therefore this claim is not accurate for most vaccines.
Option 4: "None of the above". Since option 1 correctly describes the basic mechanism of how vaccines work, claiming that none of the statements are true would be inconsistent with well-established immunology. This makes option 4 incorrect.
Across these choices, the reasoning hinges on understanding that vaccines present an antigen (or components that mimic an antigen) to the immune system, triggering antibody production and memory formation, rather than antibodies driving antigen production, and recognizing that vaccine formulations are typically multi-component rather than consisting of a single ingredient.
In summary, option 1 captures the correct causal relationship in the vaccine-induced immune response, while options 2, 3, and 4 contain conceptual or factual inaccuracies about how vaccines function and what they contain.

Question at position 72 Which of the following is true about most vaccines?The antigen in a vaccine induces the recipient to produce antibodyThe antibody in a vaccine induces the recipient to produce antigenThey only have one ingredientNone of the aboveClear my selection

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