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': 'Loading dose of 25mg was needed to achieve 0.5mg / L of Plasma concentration. Volume of distribution is 40L. Calculate the Bioavailabity \nSelect and explain. \nA. 40%, B. 50%, C. 80%, D. 70%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]