Which antiparkinson drug causes an increase in the levels of dopaminergic stimulation in the central nervous system and therefore allows a decreased dose of other medications?

The correct answer is - selegiline.

Explanation:

Selegiline is a medication that acts as the enzyme blocker. It is an MAO inhibitor that breaks the neurotransmitters in the central nervous system in the brain of an individual.

The major neurotransmitters that are slow down by these medications are dopamine, serotonin, and norepinephrine. It is one of the major drugs that is used to treat depression and Parkinson's.

Thus, the correct answer is - selegiline.