Q. Read the following statements regarding spleen and select the correct option.
(i) Spleen is a large oval-shaped organ which mainly contains lymphocytes and phagocytes.
(ii) Spleen is a large reservoir of erythrocytes.
(iii) Spleen is a primary lymphoid organ.
(iv) Spleen acts as a filter of the blood by trapping blood-borne microorganisms.

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Solution:

Spleen is a secondary lymphoid organ.