Which of the following is not vestigial organ in human beings ?

Options

A. Rudimentary ear muscles, third molars ( wisdon teeth ), and body hair
B. Occygeal tail vertebrae and scalp muscles
C. Vermiform appendix and nictitaing membrane of the eye
D. Ear pinna, patella, and olecranon process.

Answer

To determine which of the following is not a vestigial organ in human beings, we first need to understand what vestigial organs are. Vestigial organs are structures that have lost most or all of their original function through the course of evolution. They are remnants of organs that were functional in ancestral species but have become non-functional or reduced in size and utility in modern organisms.

### Step-by-Step Solution:

1. **Define Vestigial Organs**:
- Vestigial organs are rudimentary structures that correspond to organs that were functional in ancestral species but have lost their function over time.

2. **Identify Examples of Vestigial Organs in Humans**:
- Common examples of vestigial organs in humans include:
- Wisdom teeth
- Ear muscles
- Coccyx (tailbone)
- Appendix
- Nictitating membrane of the eye

3. **Analyze the Options Given**:
- We need to look at the options provided in the question and identify which one is not a vestigial organ.
- Options may include:
- Ear pinna
- Patella (knee bone)
- Olecranon process (part of the ulna)
- Coccyx
- Appendix

4. **Evaluate Each Option**:
- **Ear Pinna**: This structure is functional as it collects sound waves and is not vestigial.
- **Patella**: This knee bone is functional and protects the knee joint, so it is not vestigial.
- **Olecranon Process**: This part of the ulna is functional in the elbow joint, thus not vestigial.
- **Coccyx**: This is a vestigial structure as it is a remnant of a tail.
- **Appendix**: This is also considered vestigial as it has lost its primary digestive function.

5. **Conclusion**:
- The structures that are not vestigial organs in humans are the **Ear Pinna**, **Patella**, and **Olecranon Process**. Among these, any of these three can be considered the answer to the question, as they all retain their original functions.

### Final Answer:
**Ear Pinna, Patella, and Olecranon Process are not vestigial organs in humans.**