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
Natural elements having anticancer properties   a) Nitrosoamines  b)  Vit. C  c) Vit. D  d) Carotene  e) Selenium 
Select and explain. 
A. de, B. bde, C. be, D. ab
B: bde
Answer: B: bde 
Explanation: None