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': 'Which of the following drugs does not activate opioid receptors, has been proposed as a drug in the management of opioid addiction and with just a single dose blocks the action of injected heroin for up to 48 hours ? \nSelect and explain. \nA. Amphetamine, B. Buspirone, C. Methadone, D. Naltrexone', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]