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': 'Therapeutic plasma level of the digoxin is \nSelect and explain. \nA. 0.1-0.3 ng/ml, B. 0.8-1.5 ng/ml, C. 1.2-2 ng/ml, D. More than 2.4 ng/ml', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref-KDT 6/e p497 Digitoxin digoxin Therapeutic plasma concentration 15-30ng/ml 0.5-1.4 ng/ml Toxic plasma concentraton >35 ng/ml >2.5 ng/ml', 'role': 'assistant'}]