The correct option is D 1- b, 2- a, 3- d and 4- c
Nissl body is a large granular body found in neurons. So, option 1 matches with option b.
Ossein is the collagen of bone after the mineral matter has been removed by the treatment with dilute acid. So, option 2 matches with option a.
Mammalian erythrocytes are unique among the vertebrates as they are non-nucleated cells in their mature form. So, option 3 matches with option d.
Lymphocyte is any of the three WBCs in vertebrates and is responsible for the production of antibodies. So, option 4 matches with option c.
Thus, the correct answer is option (D), '1- b, 2- a, 3- d and 4- c'.