Although L-Dopa Does Have Some Beneficial Effects,it Is Not a Solution

Multiple Choice

Although L-dopa does have some beneficial effects,it is not a solution to the problem of Parkinson's disease because it

A) typically becomes less and less therapeutically effective with use.
B) is too expensive.
C) can be safely administered to only a small proportion of patients.
D) is unstable at room temperature.
E) does not pass through the blood-brain barrier.