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': 'Therapeutic drug monitoring is required for: \nSelect and explain. \nA. Prodrugs, B. Levodopa, C. Lithium carbonate, D. MAO inhibitors', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]