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': 'Time required to reach the steady state after a dosage regimen depends on: \nSelect and explain. \nA. Route of administration, B. Half life of a drug, C. Dosage interval, D. Dose of drug', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (B) Half life of a drug(Ref: KDT 8th/e p40-41)* After a dosage regimen, concentration of the drug to reach the steady state (when the elimination balances the input) is called steady state plasma concentration Cpss.* Cpss is reached in about 4-5 half lives.* The amplitude of fluctuations in Cpss depends on the dose interval relative to t1/2 .', 'role': 'assistant'}]