Identify the antibody present in colostrum.

The correct answer is Option (1) → IgA

Passive immunity involves the direct administration of pre-formed antibodies to provide immediate protection against foreign agents. An example of passive immunity is the yellowish fluid called colostrum, which is secreted by a mother during the initial days of lactation. Colostrum contains abundant antibodies, particularly IgA, which serve to protect the infant. Additionally, during pregnancy, the fetus receives a supply of antibodies from the mother through the placenta.