Question

Which of the following is abundantly found in colostrum?

• A. IgA
• B. IgG
• C. IgM
• D. IgD

Hint:

IgA in colostrum provides passive immunity to infants against respiratory and gastrointestinal infections.

Answer 1

The Correct Option is A

Step 1: Understanding colostrum.
Colostrum is the first secretion from the mammary glands after childbirth, rich in antibodies that protect the newborn.
Step 2: Key antibody.
IgA is the main immunoglobulin present in colostrum, which protects mucous membranes of infants from infections.
Step 3: Option analysis.
(1) IgA – Correct, abundantly present in colostrum.
(2) IgG – Present but not in high concentration.
(3) IgM – Found in trace amounts.
(4) IgD – Rarely present in colostrum.
Step 4: Conclusion.
Thus, the correct answer is (1) IgA.