This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oncology, Subject name: Medicine
[{'content': 'Natural elements having anticancer propeies - \nSelect and explain. \nA. Nitrosoamines, B. Vit. C, C. V1L D, D. Carotene', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Actions of vitamin C include antioxidant activity, promotion of nonheme iron absorption, carnitinebiosynthesis, conversion of dopamine to norepinephrine, and synthesis of many peptide hormones. Vitamin C is also impoant for connective tissue metabolism and cross-linking (proline hydroxylation), and it is a component of many drug-metabolizing enzyme systems, paicularly the mixed-function oxidase systems . The antioxidant activity of Vit C results in anticancer propeies . Ref - Harrison internal medicine 20e p2313', 'role': 'assistant'}]