## **Core Concept**
Major depressive disorder (MDD), commonly known as depression, is a mental health condition characterized by persistent and intense feelings of sadness or hopelessness. The diagnosis of major depression involves a combination of clinical symptoms and a duration criterion. The **Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5)** provides standardized criteria for diagnosing psychiatric conditions, including major depression.

## **Why the Correct Answer is Right**
The correct answer, **2 weeks**, is the minimum duration required for the diagnosis of major depressive disorder. According to the DSM-5, for a diagnosis of major depression, at least five of the following symptoms must be present during the same 2-week period, and at least one of the symptoms must be either depressed mood or loss of interest or pleasure:
- Depressed mood
- Markedly diminished interest or pleasure in all, or almost all, activities
- Significant weight loss when not dieting or weight gain, or decrease or increase in appetite
- Insomnia or hypersomnia
- Psychomotor agitation or retardation
- Fatigue or loss of energy
- Feelings of worthlessness or excessive or inappropriate guilt
- Diminished ability to think or concentrate, or indecisiveness
- Recurrent thoughts of death, recurrent suicidal ideation without a specific plan, or a suicide attempt or a specific plan for committing suicide.

## **Why Each Wrong Option is Incorrect**
- **Option A: 1 week** - This duration is too short for the diagnosis of major depression according to the DSM-5 criteria. Some symptoms can be present for a week and may not meet the full criteria for major depression.
- **Option C: 1 month** - Although a longer duration might provide more clarity on the persistence of symptoms, the DSM-5 specifically requires a minimum of 2 weeks for the diagnosis of major depression.
- **Option D: 6 months** - This duration is longer than required for the initial diagnosis of major depression. However, it might be relevant for certain specifiers or for assessing the need for ongoing treatment.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the diagnosis of major depression requires both a certain number of symptoms (at least 5) and a minimum duration of **2 weeks**. Clinicians must also consider the impact of these symptoms on the individual's social, occupational, or other areas of functioning.

## **Correct Answer:** . 2 weeks