Which of the following statements concerning immunological memory is true?
a. the memory response involves only b cells.
b. the memory response is due to production of long-lived memory cells that can respond very rapidly upon second exposure.
c. antibodies produced in response to a secondary infection are mostly igm.
d. the memory response is usually faster but not as strong.

Option B

The memory response is due to long lived cells that can respond rapidly to second exposure.

Explanation:

Immunological memory is the ability of the immune system to quickly identify and remember an antigen from a pathogen that the body has encountered before and initiate a faster immunological response upon a reencounter with the particular antigen. This dependents on colonial selection.. The memory cells have a long life span and can remain in the body for a long time. When it encounter the antigen its previously encountered for the second time, they mobilize quickly and become plasma cells, these secrets a lot of antibodies and cause a stronger reaction to defend against such antigen in a short time.