What Is the Rationale for Administering Levodopa Instead of Dopamine

Multiple Choice

What is the rationale for administering levodopa instead of dopamine for treatment of Parkinson's disease?

A) Dopamine does not cross the blood-brain barrier when administered orally.
B) Levodopa is much less expensive.
C) The half-life of dopamine is too short.
D) Dopamine has too many reactions with other medications.