So here we have a pretty straightforward example problem that asks, what is the primary function of reticular fibers in lymphoid tissues? And we've got these 4 potential answer options down below. Now option a says to produce antibodies, which are Y-shaped proteins that provide immune functions, and we'll get to talk a lot more about antibodies later in our course when we're focusing on immunity. But these antibodies are not produced by reticular fibers. Instead, it's B cells or B lymphocytes that develop into antibody-producing plasma cells. But, again, these reticular fibers don't produce these antibodies, so we can eliminate answer option a.
Now, option b says, to engulf pathogens. However, pathogens are going to be engulfed or phagocytosed by macrophages, not by reticular fibers. So for that reason, we can eliminate answer option b. Option c says, to present antigens to B cells. However, the antigen presentation is going to occur with dendritic cells, not through reticular fibers. And so, for that reason, we can eliminate answer option c. And, of course, this leaves answer option d as the only option which is the correct answer. And so the primary function of these reticular fibers in lymphoid tissues is to provide a supportive meshwork for lymphoid cells to proliferate and to optimize immune actions. And so answer option d is the correct answer to this example. That concludes this example, and I'll see you all on our next video.