An antibody present in colostrum is

Options

A. IgG
B. IgA
C. IgM
D. IgD

Answer

To solve the question "An antibody present in colostrum is," we need to identify the type of antibodies that are found in colostrum. Here’s a step-by-step solution:

### Step 1: Understand Colostrum
Colostrum is the first form of milk produced by mammals immediately following the delivery of the newborn. It is rich in antibodies and nutrients, which are crucial for the newborn's immune defense.

**Hint:** Remember that colostrum is produced in the initial days after birth and is different from regular milk.

### Step 2: Identify the Antibodies
Antibodies are proteins produced by the immune system in response to antigens. There are several classes of antibodies, including IgG, IgA, IgM, and IgD.

**Hint:** Recall the different classes of antibodies and their functions in the immune response.

### Step 3: Focus on the Role of Antibodies in Colostrum
The primary function of antibodies in colostrum is to provide passive immunity to the newborn. This is particularly important because newborns have immature immune systems.

**Hint:** Consider which antibody class is known for mucosal immunity and is often found in secretions.

### Step 4: Identify the Correct Antibody
Among the options given (IgG, IgA, IgM, and IgD), the antibody that is most abundant in colostrum is IgA. IgA plays a crucial role in mucosal immunity and is important for protecting the infant's gastrointestinal tract.

**Hint:** Think about which antibody is primarily found in secretions such as saliva, tears, and breast milk.

### Conclusion
The antibody present in colostrum is **IgA**.

**Final Answer:** IgA