A 48-year-old female psychiatric patient has parkinsonism secondary to long-term neuroleptic use. Which of the following medications might minimize her parkinsonism?
a. Trihexyphenidyl (Artane)
b. Haloperidol (Haldol)
c. Methamphetamine
d. Thioridazine (Mellaril)
e. L-dopa