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': 'Therapeutic plasma level of digoxin is: \nSelect and explain. \nA. 0.1–0.3 ng/ml, B. 0.8–1.5 ng/ml, C. 1.2 to 2 ng/ml, D. More than 2.4 ng/ml', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]