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': 'Drug remaining in the body after 3 half lives is: \nSelect and explain. \nA. 12.50%, B. 75%, C. 87.50%, D. 94%', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]