Why Are People Who Take Medication for Schizophrenia Often Given

Why are people who take medication for schizophrenia often given medication that helps control shaking and tremors?

A) Schizophrenia often leads to the development of Parkinsonism.
B) Medication used to treat schizophrenia leads to Parkinson-like symptoms.
C) Dopamine is used to treat both schizophrenia and Parkinsonism.
D) Too little or too much dopamine (an imbalance) leads to Parkinsonism and schizophrenia.