1.       A 25 year man with a psychotic illness, was treated with haloperidol 30 mg/day. On the third day he developed pacing, and inability to sit at one place. The medication likely to be helpful is

a.       Pheytoin

b.     Propranolol

c.       Methylphenidate

d.       Trihexyphenedyl 

Ans  ; b