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
Amount of a drug X administered to a patient is 4.0 g and its plasma concentration is found to be 50 mg/ml,what will be the volume of distribution of drug X ? 
Select and explain. 
A. 100L, B. 80L, C. 60L, D. 50L
B: 80L
Answer: B: 80L 
Explanation: None