**Question:** The characteristic symptom of organic psychosis is

A. Confusion
B. Hallucinations
C. Delusions
D. Disorganized speech and behavior

**Correct Answer:** D. Disorganized speech and behavior

**Core Concept:** Organic psychosis is a term used to describe a psychotic disorder caused by a physiological or biological issue in the body, typically affecting the brain. These disorders are often associated with other organic brain disorders, such as stroke, dementia, or neurological diseases. The symptoms of organic psychosis typically arise from the underlying organic cause and are not directly related to the psychotic process.

**Why the Correct Answer is Right:** In organic psychosis, the primary symptom is disorganized speech and behavior, often referred to as catatonia. This is due to the impact of the underlying organic condition on the brain, leading to impaired cognitive and motor functions. Organic psychosis is often characterized by the presence of catatonia, which is a specific motor symptom cluster that includes stereotyped, repetitive, and immobile or immobilized postures, waxy flexibility, posturing, stupor, mutism, echopraxia, echolalia, and echopatria.

**Why Each Wrong Option is Incorrect:**

A. Confusion is a symptom that can be present in organic psychosis, but it is not the primary characteristic symptom. Disorganized speech and behavior (catatonia) are more indicative of the organic cause.
B. Hallucinations are a symptom of psychotic disorders, but they are not specific to organic psychosis. Organic psychosis is characterized by the combination of disorganized speech and behavior, alongside other symptoms associated with the underlying organic condition.
C. Delusions are a symptom of psychotic disorders, including organic psychosis. However, the focus here is on the primary symptom of disorganized speech and behavior (catatonia).

**Clinical Pearl:** Organic psychosis is often associated with other organic brain disorders, such as dementia and neurological conditions. It is essential to consider organic psychosis when evaluating patients presenting with disorganized behavior, speech, and motor function, as these symptoms may arise from a variety of physical conditions. Early recognition and treatment of the underlying organic cause are crucial for better prognosis and management of the patient.