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': 'Which of the following abolishes the therapeutic effect of levodopa : \nSelect and explain. \nA. Thiamine, B. Carbidopa, C. Pyridoxine, D. Benserazide', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pyridoxine abolishes the therapeutic effect of levodopa by enhancing peripheral decarboxylation of levodopa, less is available to cross to the brain.', 'role': 'assistant'}]