According to the Textbook, One Hypothesis in Psychoneuroimmunology Is That

Multiple Choice

According to the textbook, one hypothesis in psychoneuroimmunology is that depression in some people may be related to

A) the number of cytokines circulating in the blood.
B) the number of white blood cells that attack invading microbes.
C) the degree to which antibodies produce cytokines.
D) the circulation of hormones within the thalamus.