**Question:** True about Major depressive disorder:

A. It is a psychiatric disorder characterized by persistent feelings of sadness and loss of interest in activities.
B. Major depressive disorder (MDD) is often associated with physical symptoms like weight loss or gain, changes in appetite, and insomnia or hypersomnia.
C. Treatment for MDD primarily involves lifestyle changes and medication targeting mood stabilizers or antipsychotics.
D. MDD is primarily caused by environmental factors like childhood trauma or family history.

**Correct Answer:**

**Core Concept:** Major depressive disorder (MDD) is a psychiatric illness characterized by persistent depressive symptoms. It is a significant mood disorder that affects an individual's ability to function normally in daily life. MDD is classified as a type of mood disorder, specifically a major depressive episode, within the Diagnostic and Statistical Manual of Mental Disorders (DSM) and the International Classification of Diseases (ICD).

**Why the Correct Answer is Right:**

MDD is a complex condition influenced by both genetic and environmental factors. The DSM and ICD classify MDD as an episode of major depressive disorder, which is characterized by a minimum of two weeks of depressed mood or loss of interest in activities. This condition is not solely explained by environmental factors like childhood trauma, but rather involves a combination of genetic, neurobiological, and environmental factors.

**Why Each Wrong Option is Incorrect:**

A. While it is true that MDD involves persistent depressive symptoms, the statement "It is a psychiatric disorder characterized by persistent feelings of sadness and loss of interest in activities" is not entirely accurate. MDD is a complex disorder influenced by multiple factors, and simply describing it by its symptoms does not fully capture its complexity.

B. While MDD may cause physical symptoms like weight loss or gain, changes in appetite, and insomnia or hypersomnia, the statement "Major depressive disorder (MDD) is often associated with physical symptoms like weight loss or gain, changes in appetite, and insomnia or hypersomnia" is partially correct. However, it is essential to recognize that these symptoms are common to many other conditions as well, making them insufficient to diagnose MDD solely based on physical symptoms.

C. Treatment strategies for MDD can involve lifestyle changes and medication targeting mood stabilizers or antipsychotics. While these options may be part of a treatment plan, the statement "Treatment for MDD primarily involves lifestyle changes and medication targeting mood stabilizers or antipsychotics" is misleading. MDD treatment involves a comprehensive approach that includes psychotherapy, lifestyle modifications, and pharmacotherapy, with a combination of different classes of medications, such as selective serotonin reuptake inhibitors (SSRIs), serotonin-norepinephrine reuptake inhibitors (SNRIs), atypical antipsychotics, and mood stabilizers.

D. The statement "MDD is primarily caused by environmental factors like childhood trauma" is overly simplified and does not fully encompass the complexity of MDD etiology. MDD is influenced by a combination of genetic, neurobiological, and environmental factors, making it a multifactorial disorder.

**Clinical Pearls:**