**Core Concept**
Anorexia Nervosa is a complex eating disorder characterized by a distorted body image and an intense fear of gaining weight, leading to restrictive eating habits and significant weight loss. The condition involves a combination of psychological, social, and physiological factors.

**Why the Correct Answer is Right**
Anorexia Nervosa is typically characterized by a significant restriction of food intake, resulting in a low body mass index (BMI) and potential malnutrition. The condition is often associated with a distorted body image, where individuals perceive themselves as overweight even when they are severely underweight. This distorted perception is thought to be influenced by a combination of genetic, environmental, and psychological factors.

**Why Each Wrong Option is Incorrect**
**Option A:** While Anorexia Nervosa is often associated with a restrictive eating pattern, it can also involve binge-eating episodes, especially in the purging subtype. However, this is not a defining characteristic of the condition.
**Option B:** Anorexia Nervosa is indeed characterized by a significant fear of gaining weight, which is a core aspect of the condition. This fear can lead to restrictive eating habits and other maladaptive behaviors.
**Option C:** Individuals with Anorexia Nervosa often exhibit obsessive-compulsive behaviors, such as excessive exercise or ritualistic eating patterns, which can be a manifestation of their distorted body image and fear of weight gain.

**Clinical Pearl / High-Yield Fact**
A key clinical feature of Anorexia Nervosa is the presence of amenorrhea, which is often one of the earliest signs of the condition. Amenorrhea can occur due to the significant weight loss and malnutrition associated with Anorexia Nervosa, leading to hormonal imbalances and reproductive dysfunction.

**Correct Answer:**
A.