A function of lymph nodes is to​

A) ​secrete thymosin.
B) ​serve as a holding station for red blood cells.
C) ​cleanse lymph of foreign debris.
D) ​all of these.

Lymph nodes are small, bean-shaped structures that are part of the lymphatic system. They act as filters for the lymphatic fluid and help to remove foreign substances such as bacteria, viruses, and cancer cells. They contain specialized immune cells called lymphocytes and macrophages that can recognize and eliminate unwanted substances. While lymph nodes do secrete some hormones and other signaling molecules, such as cytokines, they do not produce thymosin. They also do not hold red blood cells, which are primarily produced and stored in the bone marrow.