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Multiple Choice: Chapter 23 Micronutrients: Protective and defence roles I Question 1. Which one of the following statements is incorrect? A Vitamin A deficiency is associated with increased severity of respiratory and diarrhoeal diseases and measles B Vitamin C supplementation reduces the risk of the common cold C Immune system defences include the killing of invading organisms by a burst of superoxide radicals D In animal studies, viruses passing through selenium-deficient hosts may mutate to more virulent forms