cortisol

Stress can be defined as something that alters homeostasis. A disease, a stress, invades the body and is attacked by the body's immune system. the role that cortisol plays is
A. as an anti-inflammatory agent, but very high levels of cortisol make poeple more susceptible to infections
B. to treat inflammation of joint injuries, but very high levels make people more susceptible to arthritis
C. a product medically referred to as hydrocortisone, which can be used to treat individuals undergoing cardiac arrest
D. as glucocorticoid that promotes sodium ion retention byt he kidneys
ps. why is it that high levels can make people more susceptible to infections?