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: Physiology
[{'content': 'Therapeutic plasma level of digoxin is \nSelect and explain. \nA. 0.1-0.3 ng/ml, B. 0.5-1.4 ng/ml, C. 1.2 to 2 ng/ml, D. More than 2.4 ng/ml', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Oral absorption of digoxin is 60-80 %Plasma half-life is about 40 hrsToxic concentration is >2ng/ml(Ref: Essentials of medical pharmacology, K.D Tripathi, 7th edition)', 'role': 'assistant'}]