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
The protective effects of breast milk are known to be associated with: 
Select and explain. 
A. IgM antibodies, B. Lysozyme, C. Mast cells, D. IgA antibodies
D: IgA antibodies
Answer: D: IgA antibodies 
Explanation: d. IgA antibodies(Ref: Nelson's 20/e p 286-290, Ghai 8/e p 150-161)Although antibodies & lysozyme, both are important for protective effects of breast milk, antibodies (IgA) play a major role.