Choose the correct pair.

Options

A. Gynecomastia – Development of breasts
B. Turner’s syndrome – Loss of an X-chromosomes in females
C. Syndrome- A group of symptoms
D. All of these

Answer

To solve the question "Choose the correct pair," we need to analyze the given options one by one to determine their correctness.

### Step-by-Step Solution:

1. **Understanding Gynecomastia**:
- Gynecomastia refers to the abnormal enlargement of breast tissue in males. It can occur due to hormonal imbalances, particularly an increase in estrogen or a decrease in testosterone.
- **Conclusion**: The definition of gynecomastia is correct.

2. **Understanding Turner Syndrome**:
- Turner syndrome is a chromosomal disorder that affects females, characterized by the absence of all or part of a second X chromosome (45,X karyotype).
- This condition leads to various developmental issues and is indeed related to the loss of an X chromosome.
- **Conclusion**: The description of Turner syndrome is also correct.

3. **Understanding Syndrome**:
- A syndrome is a collection of signs and symptoms that occur together and characterize a particular abnormality or condition.
- This definition is accurate and applies to various medical conditions.
- **Conclusion**: The statement about syndromes being a group of symptoms is correct.

4. **Final Evaluation**:
- Since all three statements (about gynecomastia, Turner syndrome, and the definition of a syndrome) are correct, we can conclude that the correct answer is option D, which states "all of these."

### Final Answer:
The correct answer is **D: All of these**.

---