## **Core Concept**
The question pertains to specific psychological symptoms associated with certain psychiatric conditions. The feeling of uncertainty and an excessive sense of responsibility are key features that can help in diagnosing and differentiating between various psychiatric disorders.

## **Why the Correct Answer is Right**
The correct answer, **Obsessive-Compulsive Disorder (OCD)**, is associated with a feeling of uncertainty and an excessive sense of responsibility. In OCD, individuals often experience obsessions, which are recurrent and persistent thoughts, urges, or images that are intrusive and cause distress. Compulsions are repetitive behaviors or mental acts that an individual feels driven to perform in response to an obsession or according to rules that must be applied rigidly. The excessive sense of responsibility is a crucial cognitive factor that fuels the obsessive-compulsive cycle. Individuals with OCD often report feeling uncertain about their actions or thoughts, leading to an increased sense of responsibility to prevent harm.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While anxiety disorders can present with feelings of uncertainty, they are not specifically characterized by an excessive sense of responsibility to the same extent as OCD.
- **Option B:** Depression is primarily characterized by persistent sadness, loss of interest, and other mood-related symptoms, rather than the specific cognitive features mentioned.
- **Option D:** Post-Traumatic Stress Disorder (PTSD) involves symptoms that occur after a traumatic event, including flashbacks, severe anxiety, and uncontrollable thoughts about the event. While uncertainty and a sense of responsibility might be present, they are not hallmark symptoms.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that the sense of responsibility in OCD often leads to compulsions aimed at reducing anxiety or preventing a perceived catastrophe. This understanding is crucial for cognitive-behavioral therapy (CBT), particularly exposure and response prevention (ERP), which is a first-line treatment for OCD.

## **Correct Answer:** C. OCD.