Regarding the development of PTSD,
a. genetics is responsible as indicated by the presence of the COMT enzyme that destroys catecholamines.
b. the environment produces individuals who are more likely to experience PTSD as evidenced by the fact that people who experience more traumatic events are more likely to be affected.
c. there appears to be an interplay between genetics and environment.
d. the Val158Met polymorphism is responsible.
Answer: C
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