The client was prescribed the antiparkinsonian medication carbidopa-levodopa shortly after being diagnosed with Parkinson's disease. Before starting the medication, the nurse in the healthcare provider's office explained the action of carbidopa-levodopa as part of medication teaching.
Which statement explains the mechanism of action of carbidopa-levodopa in the treatment of Parkinson's disease?
a. Carbidopa-levodopa counteracts the neurotransmitter acetylcholine and restoresthe natural balance of neurotransmitters in the CNS.
b. Carbidopa-levodopa inhibits dopamine breakdown, leading to increased amountsof dopamine available in the CNS.
c. Carbidopa-levodopa causes a release of dopamine from neuronal storage sites and blocks re-uptake of dopamine.
d. Carbidopa-levodopa is converted to dopamine and provides an exogenous form of dopamine replacement.

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