Antitoxin injection provides artificial passive immunity

Steps:

• Immunity types: Active involves the body producing antibodies; passive involves receiving pre-formed antibodies.
• Antitoxin is pre-formed antibodies against toxins, injected directly, so it confers passive immunity.
• This method is artificial because it comes from external medical intervention, not natural exposure.
• Thus, the description is artificial passive immunity.

Why B is correct:

• Matches the definition of artificial passive immunity, where injected antitoxins provide immediate, short-term antibody protection without stimulating the body's own response.

Why the others are wrong:

• A: Incorrectly labels it active, as the body does not produce antibodies.
• C: Includes active and natural, but it's neither self-generated nor from natural sources like infection.
• D: Omits artificial aspect, as injection is a deliberate medical procedure, not natural.

Final answer: B