The hippie movement was during the:

Which of these is NOT a basic condition that must be met before a cause-and-effect relationship between a risk factor and a health outcome can be inferred?

A) The evidence must be consistent. B) The relationship need not make sense. C) There must be a dose-response relationship. D) The alleged cause must have been in place before the health outcome appeared.

Two or more of the symptoms for Persistent Depressive Disorder have to be present in order for a person to be diagnosed.

a. true b. false