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 absent in breast milk? \nSelect and explain. \nA. Iron, B. Vitamin A, C. Vitamin D, D. None of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The earlier teaching that human milk is deficient in vitamin D is no longer accepted. Vitamin D is present in human milk in water-soluble form. Human milk contains more vitamin A and vitamin C than cows milk.Recent work shows that iron contained in milk has a high level of bioavailability.Ref: Park; 23rd ed; Pg: 540', 'role': 'assistant'}]