Question

which of the following is the largest mass of lymphoid tissue and serves to filter the blood?
lymph nodes
spleen
peyers patches
tonsils

Explanation:

The spleen is the largest mass of lymphoid tissue in the body and filters the blood, removing old or damaged blood cells and pathogens. Lymph nodes filter lymph, Peyer's patches are in the small - intestine and filter intestinal contents, and tonsils are part of the immune response in the throat but not the largest lymphoid mass for blood - filtering.

Answer:

B. Spleen