Which of the following is the main treatment for Parkinson's disease
Question : Which of the following is the main treatment for Parkinson's disease?
A. Levodopa
B. Dopamine receptor antagonists
C. Anticholinergic drugs
D. Amantadine
Answer: A
Explanation: Parkinson's disease is caused by the degeneration of dopaminergic neurons in the substantia nigra, leading to dopamine deficiency. Levodopa is a precursor of dopamine that can cross the blood-brain barrier and be converted into dopamine, significantly improving motor symptoms, and is the gold standard for treatment. Dopamine receptor antagonists worsen symptoms; anticholinergic drugs and amantadine are used for mild symptoms or as adjuvant treatments. Thus, the correct answer is A.
