Secondary sex organ is

Options

A. Testis
B. Breast
C. Beard
D. Vas deferena.

Answer

To determine which option represents a secondary sex organ, let's analyze the options provided:

1. **Understanding the Question**: The question asks for a secondary sex organ. Secondary sex organs are those that assist in the reproductive process but are not directly involved in the production of gametes (sperms or eggs).

2. **Analyzing the Options**:
- **A. Testes**: The testes are primary sex organs because they produce sperm and hormones like testosterone.
- **B. Presse**: This option seems to be a typographical error or a non-standard term; it does not refer to any known reproductive organ.
- **C. Pierre**: Similar to 'presse', this does not correspond to any recognized reproductive organ.
- **D. Vas deferens**: The vas deferens is a tube that transports sperm from the epididymis to the ejaculatory duct. It plays a crucial role in the male reproductive system.

3. **Identifying the Correct Answer**: Among the options, the vas deferens is the only one that qualifies as a secondary sex organ since it assists in the transportation of sperm during ejaculation.

4. **Conclusion**: Therefore, the correct answer is **D. Vas deferens**.