**Delusional Disorders and Their Association with Delusions**

**Core Concept**
Delusions are firmly held false beliefs that are not amenable to change in light of conflicting evidence. They are a hallmark of various psychiatric disorders, including schizophrenia, delusional disorder, and mood disorders with psychotic features.

**Why the Correct Answer is Right**
Delusions are a characteristic feature of schizophrenia, particularly in the context of hallucinations and disorganized thinking. They can also be seen in delusional disorder, where a single delusion dominates the person's thoughts and behaviors. Additionally, delusions can occur in mood disorders, such as bipolar disorder or major depressive disorder, especially when accompanied by psychotic symptoms. However, not all psychiatric conditions are associated with delusions.

**Why Each Wrong Option is Incorrect**
**Option A:** Schizophrenia is a disorder characterized by delusions, hallucinations, disorganized thinking, and negative symptoms. It is a correct association.
**Option B:** Delusional disorder is a psychiatric condition where a person has one or more non-bizarre delusions, making it a correct association.
**Option C:** Mood disorders with psychotic features, such as bipolar disorder or major depressive disorder, can also be associated with delusions, making it incorrect.

**Clinical Pearl / High-Yield Fact**
Remember the mnemonic "SHUT" to recall disorders associated with delusions: Schizophrenia, Hallucinations, Unusual thought content, and delusional disorder.

**Correct Answer:** C. Mood disorders with psychotic features are not typically associated with delusions as a primary feature.