This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast Milk & Breast Feeding, Subject name: Pediatrics
Colostrum is rich in: 
Select and explain. 
A. IgA, B. IgE, C. IgG, D. IgM
A: IgA
Answer: A: IgA 
Explanation: Colostrum contains more antibodies (IgA), immunocompetent cells & vitamins A,D,E,K