**Question:** Schneider's first rank symptoms is seen in: March 2011

**Core Concept:** Schneider's first rank symptoms refer to a set of early psychotic symptoms described by Kurt Schneider in his 1950s classification of psychotic disorders. These symptoms are considered hallmark features of schizophrenia and are often used for diagnosis.

**Why the Correct Answer is Right:** The correct answer, option C, refers to the presence of a delusion of reference, which is a Schneider's first rank symptom. A delusion of reference occurs when a person believes that their thoughts, actions, or communications are controlled or influenced by others, often leading to the individual feeling pursued, watched, or insulted by others even when there is no evidence to support these beliefs.

**Why Each Wrong Option is Incorrect:**

A. Delusions of grandeur (option A) refer to the belief in one's superiority or exceptional abilities, while delusion of reference is related to feeling influenced or controlled by others.
B. Hallucinations (option B) involve perceiving sensory experiences without external stimuli, while delusion of reference involves subjective experiences of being manipulated or controlled.
C. Delusion of reference, as explained above, is the correct answer and is characterized by the belief that one's thoughts, actions, or communications are controlled or influenced by others.
D. Delusions of control (option D) are characterized by the belief that one's actions or decisions are determined by external influences, which is different from delusion of reference where one feels manipulated or controlled.

**Clinical Pearl:** Understanding Schneider's first rank symptoms, including delusion of reference, is crucial for accurate diagnosis of schizophrenia and other psychotic disorders. Delusion of reference can help clinicians differentiate it from other psychotic experiences, such as delusions of control or grandeur.

**Correct Answer:** C. Delusion of reference