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 19 year old boy suffering from chronic schizophrenia is put on haloperidol in the dose of 20 mg/day. A week after the initiation of medication the patient shows be restlessness, fidgety, irritability and cannot sit still at one place. The most appropriate treatment strategy is: 
Select and explain. 
A. Increase in the dose of haloperidol, B. Addition of anticholinergic drug, C. Addition of betablocker, D. Adding another antipsychotic drug
C: Addition of betablocker
Answer: C: Addition of betablocker 
Explanation: C i.e. Addition of B blocker