Question

Question #65f9b

Answer 1

B and The lymphocytes.

Explanation:

Memory cells are created after a lymphocyte comes in contact with an antigen.

T-Cells come in contact with an antigen presenting cell, that has a fragment of antigen, after which the cell differentiate to memory cells and plasma cells.

Same way, B-cells come into contact with an antigen directly to form plasma cells and memory cells.

Memory cells are for secondary infections while plasma cells secrete cytokines or antibodies respectively.