## **Core Concept**
Colostrum is the first milk produced by the mammary glands of female mammals (including humans) in late pregnancy and the first few days after giving birth. It is rich in antibodies and has a different composition compared to mature milk. The primary difference lies in its high content of immunoglobulins, which provide newborns with immediate immune protection.

## **Why the Correct Answer is Right**
Colostrum has a higher concentration of immunoglobulins (antibodies) compared to normal milk. These antibodies are crucial for providing the newborn with passive immunity against many infections. The immunoglobulins in colostrum are primarily IgA, which helps protect the newborn's gastrointestinal tract from infections. This unique characteristic of colostrum makes it highly beneficial for newborns, especially in their first few days of life before mature milk comes in.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, so we cannot assess its accuracy.
- **Option B:** Similarly, this option is not provided for evaluation.
- **Option C:** Without the specific details of this option, we cannot determine its correctness.
- **Option D:** This option is also not specified for assessment.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that colostrum is rich in **immunoglobulins**, particularly **IgA**, which provides critical immune protection to newborns. This is a high-yield fact because it underscores the importance of breastfeeding in the early days of life for conferring immediate immunity.

## **Correct Answer:** B. Immunoglobulins.