This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and Health, Subject name: Social & Preventive Medicine
[{'content': 'All are food fortification except:(1994) \nSelect and explain. \nA. Addition of color to saccharin, B. Addition of Vit A to food stuffs, C. Addition of extra nutrients to food stuffs, D. Iodisation of salt', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: aRef: Park, 17th ed, p. 453 & 18th ed, p. 480, 481', 'role': 'assistant'}]