**Question:** Suspiciousness is a characteristic feature of -

A. Schizophrenia
B. Depression
C. Anxiety Disorder
D. Bipolar Disorder

**Core Concept:** Suspicion or suspiciousness is a symptom that is commonly observed in various psychiatric disorders. In medical terminology, this symptom is referred to as paranoid ideation or delusional thoughts. These thoughts can be persecutory (feeling that one is being unjustly accused or attacked) or grandiose (feeling superior or unmatched).

**Why the Correct Answer is Right:** Suspiciousness is predominantly associated with schizophrenia (Schizophrenia is characterized by positive symptoms, which include delusions and hallucinations). Delusional thoughts, specifically persecutory or grandiose, are a significant component of this disorder.

**Why Each Wrong Option is Incorrect:**

A. Schizophrenia is not the only psychiatric disorder that can present with suspiciousness. However, among the given options, it is the most closely related to the concept of delusional thoughts.

B. Depression is primarily characterized by negative symptoms like emotional withdrawal, anhedonia, and psychomotor retardation, not suspiciousness as a core symptom.

C. Anxiety disorders, like panic disorder or generalized anxiety disorder, primarily present with anxiety, fear, or somatic symptoms, not delusional thoughts like suspiciousness.

D. Bipolar disorder is characterized by episodes of mania or hypomania rather than the presence of suspiciousness as a core symptom.

**Clinical Pearl:** Suspiciousness is an important clinical feature to consider when assessing a patient with psychiatric symptoms. It is essential to differentiate between persecutory and grandiose delusions, as they can help guide treatment decisions and differentiate between schizophrenia and other psychiatric disorders.

**Correct Answer:** A. Schizophrenia