What is catatonia, and in which disorders is it commonly seen?

• A. A mood symptom characterized by elevated activity
• B. A memory subtype
• C. A language disturbance
• D. A cluster of psychomotor abnormalities (stupor, catalepsy, waxy flexibility, mutism, extreme negativism); commonly seen in schizophrenia and can occur with mood disorders or medical conditions

Answer: (D)