Which statement best describes the relationship between an antibody and an antigen?

A) An antibody is specifically produced in response to an antigen.
B) An antibody is produced by T cells and an antigen is a foreign protein.
C) An antigen is presented by antigen presenting cells to plasma cells, which produce antibodies.
D) An antigen is a disease-causing organism, and antibodies are produced by B cells.
E) An antibody generally induces antigen formation.