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
[{'content': '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 ? \nSelect and explain. \nA. 100L, B. 80L, C. 60L, D. 50L', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]