**Core Concept**
Oniomania is a psychological disorder characterized by excessive buying behavior that interferes with a person's social and economic life. This condition is often associated with compulsive shopping and a preoccupation with acquiring goods.

**Why the Correct Answer is Right**
Oniomania is a type of impulse control disorder, where individuals engage in repetitive and excessive buying behavior despite negative consequences. The term "oniomania" comes from the Greek words "onios" (article) and "mania" (madness), which literally translates to "shop madness." This disorder is often linked to underlying psychological issues, such as anxiety, depression, or low self-esteem, which drive individuals to seek temporary relief through shopping.

**Why Each Wrong Option is Incorrect**
**Option A:** Kleptomania is a distinct impulse control disorder characterized by recurrent and irresistible urges to steal, often without regard for the value of the items. While kleptomania shares some similarities with oniomania, it is primarily focused on stealing rather than buying.

**Option C:** Trichotillomania is a psychological disorder characterized by a recurring and irresistible urge to pull out one's own hair, often resulting in noticeable hair loss. This condition is unrelated to buying behavior and is primarily associated with self-harm.

**Option D:** Pyromania is a psychological disorder characterized by a recurring and irresistible urge to set fires, often resulting in significant damage to property. This condition is unrelated to buying behavior and is primarily associated with destructive behavior.

**Clinical Pearl / High-Yield Fact**
Oniomania often co-occurs with other impulse control disorders, such as kleptomania, trichotillomania, or pyromania, highlighting the importance of considering a comprehensive diagnostic assessment when evaluating individuals with excessive buying behavior.

**✓ Correct Answer: B. Oniomania**