This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
A patient of schizophrenia treated for 5 years developed perioral movements. Likely diagnosis is - 
Select and explain. 
A. Tardive dyskinesia, B. Muscular dystonia, C. Akathas i a, D. Malignant neurolept syndrome
A: Tardive dyskinesia
Answer: A: Tardive dyskinesia 
Explanation: Perioral movement after antipsychotic therapy occurs in two syndromes:-


Tardive dyskinesia → Facial muscles (perioral muscles) show involuntary movement.
Rabbit syndrome → Perioral tremor.


Perioral muscles are also involved in acute dystonia, but there is a spasm of muscles (not movement) and it occurs within a week after initiation of the drug.