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': 'Half–life of lithium is: \nSelect and explain. \nA. 8 hours, B. 16 hours, C. 24 hours, D. 36 hours', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]