Which drug is classified as an antiparkinson agent?

Benztropine Mesylate is classified as an antiparkinson agent because it is primarily used to manage the symptoms of Parkinson's disease and to control drug-induced extrapyramidal symptoms, which can occur with antipsychotic medications. As an anticholinergic drug, it works by balancing the neurotransmitter levels in the brain, specifically reducing the activity of acetylcholine, which helps alleviate symptoms like tremors and muscle rigidity associated with Parkinson's disease.

The other options listed do not fit this classification as they serve different purposes. Dipyridamole is primarily used as an anticoagulant and for preventing blood clots, Nifedipine is a calcium channel blocker used to treat hypertension and angina, and Omega-3-Acid Ethyl Esters are used for lowering triglyceride levels. Thus, Benztropine Mesylate stands out as the drug specifically targeting the symptoms of Parkinson's disease.