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': 'Which of the following vitamin may have an anti infective action: September 2005 \nSelect and explain. \nA. Vitamin K, B. Vitamin D, C. Vitamin A, D. Vitamin E', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. C: Vitamin A Known as 'the anti-infective vitamin', vitamin A plays an essential role in protecting your body from infection. It keeps body surfaces healthy so they can act as barriers to invading micro-organisms. Skin and membrane alteration paly explain increased sensitivity to infection during vitamin A deficiency. Even marginal deficits may induce modifications of lung membranes. Vitamin A stimulates and enhances many immune functions including antibody response and the activity of various white blood cells such as T helper cells and phagocytes. This immune-enhancing function promotes healing of infected tissues and increases resistance to infection.", 'role': 'assistant'}]