**Core Concept:** Bulimia Nervosa is a psychiatric disorder characterized by recurrent episodes of binge eating followed by compensatory behaviors to prevent weight gain, such as self-induced vomiting, excessive use of laxatives or diuretics, excessive exercise, or a combination of these.

**Why the Correct Answer is Right:** Bulimia Nervosa is primarily characterized by compulsive eating episodes (binges) and compensatory behaviors. The correct answer (D) focuses on the compensatory behaviors, which are the core features of the disorder. The other options (A, B, and C) address different aspects of the disorder, such as the binge eating and compensatory behaviors, or are less specific to Bulimia Nervosa.

**Why Each Wrong Option is Incorrect:**

A. **Option A:** Focuses on the compensatory behaviors (self-induced vomiting, laxative abuse), which are essential features of Bulimia Nervosa but are not unique to this disorder.

B. **Option B:** Highlighting the weight loss or normal weight status is irrelevant to the core features of Bulimia Nervosa. People with Bulimia Nervosa often have a normal or slightly above-average weight despite excessive calorie intake, as they may compensate for the calories consumed during binges through purging behaviors or excessive exercise.

C. **Option C:** Mentioning the fear of weight gain is not specific to Bulimia Nervosa. People with Bulimia Nervosa often have a distorted body image and fear of weight gain, but this is also seen in other eating disorders like Anorexia Nervosa.

**Clinical Pearl:** Bulimia Nervosa is a complex psychiatric disorder involving both overeating and compensatory behaviors to prevent weight gain. Its distinguishing feature from other eating disorders is the fear of weight gain, which is not a hallmark of Anorexia Nervosa.

**Correct Answer:** C. Fear of weight gain