Secondary sex organ is

Options

A. Testis
B. Ovary
C. Beard
D. Vas deferens

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the secondary sex organ. We need to identify which of the given options qualifies as a secondary sex organ.

2. **Identifying the Options**: The options provided are:
- Testes
- Ovary
- Beard
- Vas deferens

3. **Defining Primary and Secondary Sex Organs**:
- **Primary Sex Organs**: These are the organs responsible for the production of gametes. In males, the primary sex organ is the testes, which produce sperm. In females, the primary sex organ is the ovary, which produces eggs (ova).
- **Secondary Sex Organs**: These organs assist in reproduction but do not produce gametes. They are involved in the transfer of gametes during reproduction.

4. **Analyzing Each Option**:
- **Testes**: This is a primary sex organ in males as it produces sperm.
- **Ovary**: This is a primary sex organ in females as it produces eggs.
- **Beard**: This is a secondary sexual characteristic, not an organ involved in reproduction.
- **Vas deferens**: This is a secondary sex organ in males that transports sperm from the testes to the urethra.

5. **Conclusion**: The correct answer is **Vas deferens**, as it is a secondary sex organ involved in the transfer of sperm during reproduction.

**Final Answer**: Vas deferens

---