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: Social & Preventive Medicine
[{'content': 'For which one of the following has the cytotoxic effect of vitamin on human lymphocytes in vitro at high concentration been repoed - \nSelect and explain. \nA. Vitamin A, B. Vitamin D, C. Vitamin E, D. Vitamin K', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Vitamin E o Recently the cytotoxic effect of Vitamin Eon human lymphocytes in vitro at high concentrations has been repoed. This being so, caution should he exercised against the mega-dose counsuption of Vtamin E in clinical practice.", 'role': 'assistant'}]