**Core Concept:** Major Depressive Disorder (MDD) is a psychiatric condition characterized by persistent sadness, loss of interest or pleasure, and significant changes in sleep, appetite, and energy. Diagnosis typically requires a combination of symptoms that affect a person's ability to function in daily life.

**Why the Correct Answer is Right:** The correct answer is excluded because it is not a core feature or symptom of major depression. In the DSM-5 criteria for Major Depressive Episode, seven of the following nine symptoms must be present:

1. Persistent depressed mood or loss of interest or pleasure in most activities
2. Significant weight loss or gain, insomnia or hypersomnia, or changes in appetite
3. Fatigue or loss of energy, feelings of worthlessness or excessive guilt, diminished ability to think or concentrate, or recurrent thoughts of death or suicide

**Why Each Wrong Option is Incorrect:**

A. **Option A:** Changes in sleep pattern (hypersomnia or insomnia) are considered as a symptom, not a diagnostic criterion.
B. **Option B:** Changes in appetite (weight loss or gain) are considered as a symptom, not a diagnostic criterion.
C. **Option C:** Fatigue or loss of energy is considered a symptom, not a diagnostic criterion.
D. **Option D:** Feelings of worthlessness or excessive guilt are considered symptoms, not diagnostic criteria.

**Clinical Pearl:** Major Depressive Disorder is a complex diagnosis requiring a comprehensive evaluation of a patient's symptoms, history, and physical examination findings. In clinical practice, it is essential to differentiate MDD from other conditions like bipolar disorder, adjustment disorder, or situational depression. A thorough understanding of symptoms, their duration, and clinical context is crucial for accurate diagnosis and appropriate treatment planning.