**Core Concept**
Bulimia nervosa is a serious eating disorder characterized by episodes of binge eating followed by compensatory behaviors such as self-induced vomiting, laxative abuse, or excessive exercise. This disorder is associated with severe physical and psychological consequences, including electrolyte imbalances, dental erosion, and depression.

**Why the Correct Answer is Right**
Bulimia nervosa is a type of eating disorder that involves a cycle of binge eating and purging behaviors. This cycle can lead to a range of physical complications, including dehydration, electrolyte imbalances, and gastrointestinal problems. The binge-purge cycle also has significant psychological consequences, including depression, anxiety, and low self-esteem.

* **Option A:** Anorexia nervosa is a distinct eating disorder characterized by restrictive eating patterns and significant weight loss, not binge eating and purging behaviors.
* **Option B:** Obesity is a condition of excess body fat, not an eating disorder.
* **Option D:** Avoidant/restrictive food intake disorder (ARFID) is a condition characterized by a lack of interest in eating or avoidance of certain foods due to sensory or nutritional concerns, not binge eating and purging behaviors.

**Clinical Pearl / High-Yield Fact**
Bulimia nervosa often co-occurs with other mental health conditions, such as depression and anxiety disorders, and requires a comprehensive treatment approach that addresses both the physical and psychological aspects of the disorder.

**Correct Answer:** C.