Which structure is associated with gut-associated lymphoid tissue and contains lymphatic nodules?

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Gut-associated lymphoid tissue protects the gut lining by housing immune cells ready to respond to intestinal microbes. The structure that best fits this description and contains numerous lymphatic nodules is the appendix. It is rich in lymphoid follicles within its mucosa and submucosa, contributing to immune responses to gut antigens. The thymus is a primary lymphoid organ where T cells mature and isn’t organized around gut-associated nodules. The spleen filters blood and has white pulp for systemic immunity, not gut mucosal immunity. Tonsils are part of mucosa-associated lymphoid tissue in the pharynx, not the gut itself.