This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
[{'content': 'A drug has 80% absorption and hepatic extraction ratio is 0.4. Calculate the bioavailability of drug? \nSelect and explain. \nA. 12%, B. 32%, C. 48%, D. 64%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Amount absorbed = 80% (80 molecules)Amount removed by the liver= 80*4/10= 32 molecules80-32= 48%Ref: Goodman and Gillman 12th ed/pg 20', 'role': 'assistant'}]