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
Concentration of a drug in blood is 40 microgna/ml. Dose of the drug is 200mg. Volume of distribution of the drug assuming minute elimination is ? 
Select and explain. 
A. 5 litre, B. 0.5 litre, C. 2.5 litre, D. 3 litre
A: 5 litre
Answer: A: 5 litre 
Explanation: Ans. is 'a' i.e., 5 It.