**Question:** A young male, victim of earthquake few months back, presented with complaints of recurrent and intrusive recollection of the events and thoughts with anxiety causing disturbed routine life. The likely diagnosis is:

A. Post-Traumatic Stress Disorder (PTSD)
B. Generalized Anxiety Disorder (GAD)
C. Depression
D. Social Anxiety Disorder

**Correct Answer:** A. Post-Traumatic Stress Disorder (PTSD)

**Core Concept:** Post-Traumatic Stress Disorder (PTSD) is a mental health condition that develops after experiencing or witnessing a traumatic event, such as earthquake. The condition includes symptoms like recurrent and intrusive recollection of the events and thoughts, heightened anxiety, and disturbed routine life.

**Why the Correct Answer is Right:** In this scenario, the patient presents with symptoms of intrusive thoughts, anxiety, and disrupted daily life, which are key features of PTSD. The earthquake serves as a traumatic event, leading to the development of PTSD in this individual.

**Why Each Wrong Option is Incorrect:**

A. Generalized Anxiety Disorder (GAD): GAD is characterized by excessive and uncontrollable anxiety that is not directly related to a specific traumatic event. Since the patient's anxiety is triggered by the traumatic earthquake experience, PTSD is the correct diagnosis, not GAD.

B. Depression: Depression is a mood disorder characterized by persistent sadness, loss of interest, and changes in sleep and appetite. While the patient may also experience symptoms of depression, the primary focus of the question is on the intrusive thoughts, anxiety, and disruption of daily life, which are indicative of PTSD.

C. Depression: Similar to option B, depression is characterized by persistent sadness, loss of interest, and changes in sleep and appetite. While depression may coexist with PTSD, the correct diagnosis in this scenario is focused on the patient's intrusive thoughts, anxiety, and disrupted daily life, which are typical of PTSD.

D. Social Anxiety Disorder: Social anxiety disorder involves excessive, unreasonable fear or anxiety about everyday social situations. In this case, the patient's symptoms are more consistent with the trauma-related PTSD, rather than social anxiety disorder.

**Clinical Pearls:**

1. Understanding the relationship between psychological sequelae and trauma is essential for accurately diagnosing and treating patients experiencing distress following traumatic events.
2. Although the patient may also exhibit symptoms of depression and social anxiety disorder, the primary focus in this case is on the intrusive thoughts, anxiety, and disrupted daily life, which are diagnostic criteria for PTSD.
3. The correct diagnosis of PTSD is crucial for appropriate treatment planning, which may involve psychotherapy, pharmacotherapy, or a combination of both.