Question

Secondary lymphoid organ is ______.

विकल्प

• lymph nodes

• thymus

• bone marrow

• spleen

Answer 1

Secondary lymphoid organ is lymph nodes.

Explanation:

Lymph nodes are secondary lymphoid organs where lymphocytes encounter antigens. Thymus and bone marrow are primary organs; although the spleen is also secondary, the keyed choice here is lymph nodes.