Which of the following immunoglobulins does constitute the largest percentage in human milk?
- IgM
- IgA
- IgG
- IgD
Answer
(2) IgA
Solution
As per NCERT, the yellowish fluid colostrum secreted by the mother during the initial days of lactation has abundant antibodies (IgA) to protect the infant.
∴ IgA is the main immunoglobulin of human milk; it gives passive immunity to the newborn.
Answer: (2)