Which of the following is a symptom of psychosis?

Hallucinations are indeed a hallmark symptom of psychosis. Psychosis is characterized by a disconnection from reality, which can manifest in various ways, including experiencing sensations that are not present, such as hearing voices or seeing things that others do not perceive. This symptom reflects a deviation from normal perception and cognitive processes, making it a key indicator of psychotic disorders.

In contrast, improved self-care and logical thinking are generally associated with stable mental health and cognitive functioning. Excessive energy could be indicative of conditions like mania but does not necessarily indicate psychosis itself. Therefore, hallucinations stand out as the definitive symptom associated with psychosis.