This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drug Abuse, Subject name: Forensic Medicine
[{'content': 'Chemical constituent of cigarette lighter used for volatile substance abuse is \nSelect and explain. \nA. Fluorocarbon, B. Butane, C. Acetone, D. Toluene', 'role': 'user'}, {'content': 'Answer: B \nExplanation: CIGARETTE LIGHTER - BUTANE Fluorocarbon - AEROSOLS Acetone - GLUES, DYES, NAIL POLISH REMOVER Toluene - ACRYLIC PAINTS', 'role': 'assistant'}]