Final answer:
FDCs are specialized stromal cells in the B cell follicles of lymphoid tissues and do not exhibit phagocytosis or mobility in bloodstream, nor do they present antigens to T cells. Option d.
Step-by-step explanation:
Follicular Dendritic Cells (FDCs) are highly specialized cells that play a crucial role in the immune system. Contrary to macrophages and some dendritic cells that are involved in phagocytosis and as antigen-presenting cells (APCs), FDCs have a different function.
Specifically, FDCs are specialized stromal cells found in the B cell follicles of lymphoid tissues. They are not involved in phagocytosis, nor are they mobile cells moving through the bloodstream.
Unlike other APCs such as macrophages and dendritic cells, FDCs do not present antigens to T cells. Instead, their main role is to help organize the B cell follicles and present antigens to B cells, which is critical for the maturation of B cell responses.
So Option d is correct.