This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous Questions, Subject name: Medicine
[{'content': 'Which component of cigarette smoke is responsible for C.A.D? \nSelect and explain. \nA. Nicotine, B. Tar, C. Polycyclic aromatic hydrocarbons, D. Benzene', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cigarette smoke product Effect on human body Acetaldehyde/ Anabasine Addiction Benzene Carcinogenic + cardio-toxic + reproductive potential toxicity Benzopyrene Carcinogenic Carbon monoxide Reproductive potential toxicity Vinyl chloride Carcinogenic', 'role': 'assistant'}]