Which one of the following is not the function of Lymph?

Lymph is a clear, colorless fluid that circulates through the lymphatic system, a network of vessels and tissues that helps defend the body against infections and other diseases. 

Lymph contains white blood cells, including lymphocytes, which play a crucial role in the immune system, as well as waste products, metabolic by-products, and excess fluids filtered out of the bloodstream.