A) Brain
B) Lymph nodes
C) Spleen
D) Thymus
Correct Answer: A
Solution :
Brain is not involved in the elicitation of immune system. Lymphoids organs. (i.e. organs where maturation and proliferation of lymphocytes occurs) are involved in the elicitation of immune system. Thymus, Bursa off abricus of birds and bone-marrow are primary lymphoid organs whereas lymph nodes, spleen and mucosa associated lymphoid tissues such as tonsils, Peyer's patches etc. are secondary lymphoid organs.
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