Meissner corpuscles are one of the three types of cutaneous receptors which are sensitive to fine touch. This makes option C correct. Option A is incorrect as red bone marrow and thymus are the primary lymphatic organs where lymphatic stem cells produce lymphocytes while spleen is one of the secondary lymphatic organs which serve as site of encounter of lymphocytes with the antigens. Option B is incorrect as the epithelial cells that line the lobules of thymus secrete thymosins. Option D is incorrect as the fine nerve endings in the epidermis serve as thermoreceptors. Correct answer is C.