<prompt> A 19 year old boy suffering from chronic schizophrenia is put on haloperidol in the dose of 20 mgday. 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:Increase in the dose of haloperidolAddition of anticholinergic drugAddition of betablockerAdding another antipsychotic drug  <response>: C i.e. Addition of B blocker 