Double depression occurs when .
a. the symptoms of P-DD last at least two years or longer
b. children experience twice the normal symptoms of P-DD
c. the symptoms of MDD occur simultaneously with those of P-DD
d. MDD is superimposed on P-DD

Which of the following accounts for someone who has had regular herpesvirus-mediated cold sore or genital sore flare-ups? a) re-infection by a closely related herpesvirus of a different strainb) re-infection by the same herpesvirus strainc) copies of the herpesvirus genome permanently maintained in host nucleid) copies of the herpesvirus genome permanently maintained in host cell cytoplasm