Q.
A. The secondary lymphoid organs are immature lymphocytes differentiate into antigen- sensitive lymphocytes
B. After maturation the lymphocytes migrate to secondary lymphoid organs like spleen and lymph nodes
C. The bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced
D. Spleen has a large reservoir of erythrocytes
E. None of the above
Correct choice: A
Explanation: