_________, which is used to treat rheumatoid arthritis, adrenal insufficiency, some _________, diseases of the connective tissue and gout, is taken from the adrenal ________ of animals.
a. prednisone, allergic reactions, cortex
b. hydrocortisone, respiratory conditions, gland
c. dexamethasone, skin conditions, medulla
d. cortisone, autoimmune conditions, follicle