The immunoglobulin which is mainly found in external secretions for e.g. mother's milk is......

Options :
  1. IgD
  2. IgA
  3. IgM
  4. IgE

Answer and Explanation :-

Answer: Option 2


Ig A is mainly found in external secretions. It plays a critical role in mucosal immunity. IgA exists in two isotypes, IgA1 and IgA2. While IgA1 predominates in serum (~80%), IgA2 percentages are higher in secretions than in serum (~35%)

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