This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition, Subject name: Pediatrics
[{'content': 'The protective effects of breast milk are known to be associated with ___________ \nSelect and explain. \nA. IgM antibodies, B. Lysozyme, C. Mast cells, D. IgA antibodies', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Human milk contains high concentrations of secretory IgA that prevent microorganisms from adhering to the intestinal mucosa. These protect against many infections. Ref: Page 215; Nelson textbook of pediatrics; 18th edition', 'role': 'assistant'}]