This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Drug of choice in drug-induced parkinsonism is : \nSelect and explain. \nA. Levodopa, B. Benzhexol, C. Amantidine, D. Carbidopa', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Central anticholinergics like trihexyphenidyl (Benzhexol) are the only drugs effective in drug-induced Parkinsonism.', 'role': 'assistant'}]