Question

Colostrum, the yellowish fluid, secreted by mother during the initial days of lactation is very essential to impart immunity to the newborn infants because it contains:

• A. Natural killer cells
• B. Monocytes
• C. Macrophages
• D. Immunoglobulin

Answer 1

The Correct Option is D

The question asks about the component present in colostrum, the yellowish fluid secreted by the mother during the initial days of lactation, that is crucial for imparting immunity to newborn infants.

Explanation:

Colostrum is the first form of milk produced by mammals, including humans, immediately following delivery of the newborn. This fluid is highly nutritious and has multiple benefits for the infant, primarily due to its role in providing immunity and enhancing the infant's digestion.

The correct answer is Immunoglobulin. Let's understand why:

1. Immunoglobulin (Antibodies): Colostrum is rich in immunoglobulins, especially Immunoglobulin A (IgA). These antibodies are essential for newborns because they provide passive immunity. IgA plays a critical role in mucosal immunity, helping to protect the infant against pathogens by forming a protective layer in their intestines.
2. Natural Killer Cells: While they are an essential part of the immune system, these cells are not a major component of colostrum.
3. Monocytes: These are a type of white blood cell important for the immune response but are not a significant component of colostrum.
4. Macrophages: These are another type of white blood cell involved in detecting and destroying bacteria and other harmful organisms. Like the other cells mentioned, they are not the primary component responsible for immunity in colostrum.

Therefore, the presence of immunoglobulins, particularly IgA, in colostrum is key to providing immunity to newborns, thus making Immunoglobulin the correct answer.