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: Forensic Medicine
[{'content': 'All are adulterants of heroin, except \nSelect and explain. \nA. Chalk powder, B. Quinine, C. Charcoal, D. Fructose', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Adulterants of heroin are\xa0sucrose,\xa0dextrose,\xa0fructose,\xa0lactose, mannitol, starches, inositol,\xa0chalk powder,\xa0milk powder, talcum\xa0powder,\xa0flour,\xa0quinine,\xa0procaine,\xa0lidocaine,\xa0acetyl procaine, methaphyrilene and caffeine.', 'role': 'assistant'}]