Read the passage given below carefully and answer the questions that follow:

Major Chandra, an infantry soldier, was posted in the border area with his unit. One day, an informer gave a message that terrorists had entered a school and were threatening to blow it up if some of their terrorist prisoners were not released. The major entered the school premises along with other soldiers but was shocked to see the terrorists armed with the latest weapons. Soon the firing started; the terrorists had an advantageous position and immediately shot down a few soldiers without caring for their lives. Major Chandra entered the school and started firing, which led to the killing of the terrorists, and he got badly injured. Though the Major has recovered, he still gets flashbacks and recurring nightmares.

Identify the major disorder under which Post-Traumatic Stress Disorder is categorized:

The correct option is Trauma and Stress Related Disorders.

Step-by-Step Explanation:

1. Analyzing the Passage:
The passage describes Major Chandra, who faced a highly stressful, life-threatening situation (a terrorist attack and active combat). Even after recovering physically, he continues to experience "flashbacks and recurring nightmares" related to this intense event. These symptoms are characteristic of Post-Traumatic Stress Disorder (PTSD).

2. Categorizing PTSD:
Post-Traumatic Stress Disorder (PTSD) is a mental health condition that is triggered by experiencing or witnessing a terrifying event. In standard psychological diagnostic manuals (such as the DSM-5), disorders that are directly precipitated by exposure to a traumatic or highly stressful life event are grouped together under a specific category.

3. Evaluating the Options:
- Somatic Symptom and Related Disorders: These involve prominent somatic (physical) symptoms associated with significant distress and impairment, which do not align with Major Chandra's primary psychological trauma symptoms.
- Dissociative Disorders: These involve disruptions or breakdowns of memory, awareness, identity, or perception, which is not the primary diagnostic category for PTSD.
- Bipolar and Related Disorders: These are characterized by extreme shifts in mood, energy, and activity levels (mania and depression).
- Trauma and Stress Related Disorders: This category explicitly includes disorders that result from exposure to a traumatic or stressful event, such as PTSD. Because Major Chandra's condition developed directly from the traumatic combat event, PTSD is categorized under Trauma and Stress Related Disorders.