________is a sticky white or yellow fluid secreted by the breasts during the second half of pregnancy and for a few days after birth , before breasts milk comes in.

Options

A. (1) Placenta
B. (2) Colostrum
C. (3) Egg yolk
D. (4) Blood cells

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the name of a sticky white or yellow fluid secreted by the breasts during the second half of pregnancy and for a few days after birth, before breast milk comes in.

2. **Identifying the Options**: The options provided are:
- A) Placenta
- B) Colostrum
- C) Egg yolk
- D) Blood cells

3. **Analyzing Each Option**:
- **A) Placenta**: This is an organ that connects the mother to the fetus and is involved in nutrient and oxygen transfer. It is not a fluid.
- **B) Colostrum**: This is the fluid secreted by the breasts during late pregnancy and shortly after birth. It is known for its sticky consistency and yellowish color.
- **C) Egg yolk**: This is a part of the egg in birds and reptiles, not related to mammalian lactation.
- **D) Blood cells**: These are components of blood and are not secreted by the breasts.

4. **Selecting the Correct Answer**: Based on the analysis, the only option that fits the description of a sticky white or yellow fluid secreted by the breasts is **B) Colostrum**.

5. **Conclusion**: Therefore, the answer to the question is **Colostrum**.

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