Question

Immune response to first encounter with an antigen is called

• A. Clonal selection
• B. Primary immune response
• C. Memory
• D. Secondary immune response

Answer 1

The correct option is B Primary immune response

Immune response
The specific reactivity induced in a host by an antigenic stimulus is called immune response.

Primary immune response

• When the immune system encounters a specific foreign agent for the first time, it generates immune response and eliminates the invader. This is called primary immune response.
• When a specific antigen enters into the body of a person, specific B and T cells start dividing to produce effector B and T cells for controlling disease and also produce memory B and T cells.
• It is of low intensity and the person may feel sick.

Final answer
a. Primary immune response.