Lymphocyte Activation Can Occur in Several Ways

Multiple Choice

Lymphocyte activation can occur in several ways. However, in all cases

A) lymphocytes must recognize an antigen.
B) helper T cells are activated first and they then stimulate other cells.
C) antigen-presenting cells process the antigen and present it to the lymphocytes.
D) cytokines released by the antigen stimulate the lymphocyte response.
E) antigens must be able to recognize the lymphocytes.