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': 'Study state plasma concentration is achieved after? \nSelect and explain. \nA. 2 t1/2, B. 3 t1/2, C. 4 t1/2, D. 5 t1/2', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., 5 t%", 'role': 'assistant'}]