Why Is Carbidopa Added to Levodopa for the Treatment of Parkinson's

Multiple Choice

Why is carbidopa added to levodopa for the treatment of Parkinson's disease?

A) It prevents degradation of levodopa in the periphery.
B) It minimizes some of the side effects of levodopa used alone.
C) Addition of carbidopa stabilizes levodopa by interfering with Phase III metabolism.
D) Carbidopa complexes with levodopa to allow increased solubility.