Identify the component responsible for the humoral immune response.

Which of the following is a pentameric immunoglobulin and is produced first in a primary response to an antigen?

The $D.P.T$ vaccine is an example of which type of immunity?

Which cells help $B$-cells in the production of antibodies?

The spleen is a large bean-shaped organ which primarily acts as a filter of the blood by trapping blood-borne microorganisms. Which of the following statements is correct regarding the spleen?

Which memory cells are produced during vaccination?