Final answer:
The types of cells present in the thymus are bone marrow-derived macrophages and thymocytes. Follicular dendritic cells are not matured in the thymus, making option 'e. A & C' the correct answer.
Step-by-step explanation:
The types of cells present in the thymus include bone marrow-derived macrophages and thymocytes. Bone marrow-derived macrophages are indeed present in the thymus and play a role in presenting antigens to developing T cells. Thymocytes are immature T cells, which are also present in the thymus, where they undergo maturation. Follicular dendritic cells, on the other hand, are primarily associated with B cells in the lymph nodes and do not mature in the thymus. Therefore, the correct answer to which types of cells are present in the thymus is e. A & C.