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
Maintainance dose of a drug depends upon ? 
Select and explain. 
A. CL, B. Vd, C. Lethal dose, D. Loading dose
A: CL
Answer: A: CL 
Explanation: Ans. is 'a' i.e., CL