OPT: (a). layers of fat. (b). Lymphocytes.. (c). fur and fat. (d). bone cells. (e). muscle cells. (f). the skin. (g). Red blood cells. (h). animals.
Q: Fact 1: Lymphocytes are the key cells involved in the immune response. Fact 2: An allergy attack is an immunal response. Given the two facts above, what are the key cells in an allergy attack?
A:
(b).