This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Paediatric Care in RCH: BW, BL, PEM, Breast Feeding, Subject name: Social & Preventive Medicine
Most abundant immunoglobulin present in breast milk? 
Select and explain. 
A. IgA, B. IgM, C. IgG, D. IgE
A: IgA
Answer: A: IgA 
Explanation: Most abundant type of Ig = IgA > IgD > IgG, IgM & IgE Anti-infective factors present in breast milk are: IgA (ratio of IgA: IgG is 100:1) Lymphocytes Anti- streptococcal factor Lysosome Lactoferrin Living cells.