This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
When the same dose of a drug is repeated at half life intervals, the steady-state(plateau)plasma drug concentration is reached after 
Select and explain. 
A. 2-3 half lives, B. 4-5 half lives, C. 6-7 half lives, D. 8-10 half lives
B: 4-5 half lives
Answer: B: 4-5 half lives 
Explanation: Steady state concentration of a drug is achieved after 4-5 half-lives Ref: KDT 6/e pg 30.