A client with schizophrenia, prescribed an antipsychotic medication, develops sudden, severe muscle spasms of the neck and back, causing an arched posture. The nurse recognizes this as which extrapyramidal symptom?

✓ Correct Answer: Option B

Dystonia is characterized by sudden, sustained muscle contractions, often affecting the neck (torticollis) and back (opisthotonus). It is an acute extrapyramidal symptom requiring immediate intervention.