According to the DSM-5, which of the following is a key distinguishing feature between Major Depressive Disorder (MDD) and Persistent Depressive Disorder (Dysthymia)?
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A
MDD requires psychotic features; Dysthymia does not
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B
MDD episodes last at least 2 weeks; Dysthymia involves persistent low mood for at least 2 years
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C
Dysthymia can only be diagnosed in children; MDD applies to adults
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D
MDD requires a prior manic episode to distinguish it from Dysthymia