True statement about drugs used in Parkinsonism is:
Both entacapone and tolcapone enhance and prolong the therapeutic effect of levodopa-carbidopa in advanced and fluctuating PD Ref KD Tripati 8th ed.
Amantadine is a cholinergic drug
Vitamin B6 enhances the L-Dopa action
COMT inhibitors prolong the action of L'-dopa
None
Central Nervous system