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: Medicine
[{'content': 'Natural elements having anticancer properties   a) Nitrosoamines  b)  Vit. C  c) Vit. D  d) Carotene  e) Selenium \nSelect and explain. \nA. de, B. bde, C. be, D. ab', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]