This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Pharmacology, Subject name: Pharmacology
[{'content': 'With IV infusion, a drug reaches 90% of its final steady state in 10 hours. The elimination half-life of the drug must be approximately \nSelect and explain. \nA. 1 h, B. 2 h, C. 3 h, D. 6 h', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Time to reach 90% of final steady-state plasma levels is given by: 3.3xhalflife.Because it takes 10 h to reach 90% steady state, thenHalflife=3.310 =3hTo achieve "clinical" steady state usually takes approximately 5xhalflife.', 'role': 'assistant'}]