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': 'Which of the following is the r,ichest source of Vitamin C? \nSelect and explain. \nA. Orange, B. Guava, C. Cabbage, D. Amila', 'role': 'user'}, {'content': "Answer: D \nExplanation: Orange contains 30mg ,guava-212mg,cabbage-124mg and amla contains 600mg/100g.REF.PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE.Editon-21.Page no.-573.", 'role': 'assistant'}]