Exogenous depression is usually caused by:
a. a biochemical imbalance.
b. traumatic events such as rape, assault, war, or airplane crashes.
c. external events such as the loss of something or someone of great value.
d. lack of adequate sunlight.
C-external events such as loss of something or someone of great value. Subnote: a lack of sunlight can also result in depression and the letter B are external causes of PTSD.
