What is produced in a lymph node

it produces a fluid called lymph

the lymph node is part of the adaptive immune system.

Antibodies and memory B cells.

Explanation:

The germinal center of lymphatic nodules has many cells types including B cells and follicular dendritic cells. The follicular dendritic cells bind to the entered antigen and represent it to the B cells. The proliferation of B cells produces plasma cells and memory B cells. The plasma cells further divide and produce a group of cells that differentiate into antibodies specific to the entered antigen.