Which mood disorder consists of a consistent,extremely sad mood?

Question

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Major depressive disorder is characterized by a persistent and pervasive sense of sadness or low mood. Symptoms include lack of interest in once-enjoyable activities, changes in appetite or sleep patterns, decreased energy, and feelings of worthlessness or hopelessness. This sadness can last for weeks or months and can be severe enough to interfere with daily functioning.

Which Mood Disorder Consists of a Consistent,extremely Sad Mood