MCQ IN MEDICINE

Detailed explanation-1: -Acquired immunity is immunity that develops with exposure to various antigens. Your immune system builds a defense against that specific antigen.

Detailed explanation-2: -When an antigen enters the body, the immune system produces antibodies against it.

Detailed explanation-3: -An antigen is any substance that causes your immune system to produce antibodies against it. This means your immune system does not recognize the substance, and is trying to fight it off. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen.

Detailed explanation-4: -If an antigen enters the body and B-cells recognize it (either from having had the disease before or from being vaccinated against it), B-cells will produce antibodies. When antibodies attach to an antigen (think a lock–key configuration), it signals other parts of the immune system to attack and destroy the invaders.