A vestigial organ of human is

Options

A. Ear pinna
B. Nictitating membrane
C. Knee bone
D. Hand

Explanation

**Step-by-Step Solution:**

1. **Understanding Vestigial Organs**:
- Vestigial organs are body parts that have lost most or all of their original function through the course of evolution. They are remnants from our ancestors that were once useful but are no longer necessary for survival in modern organisms.

2. **Identifying Vestigial Organs in Humans**:
- In humans, there are several organs that are considered vestigial. Some commonly known examples include the appendix, wisdom teeth, and the plica semilunaris (the nictitating membrane).

3. **Analyzing the Options Given**:
- The question provides several options: Ear, Pinna, Nictitating Membrane, Nebone, and Hand.
- Among these, we need to identify which one is a vestigial organ.

4. **Identifying the Correct Answer**:
- The **Nictitating Membrane** is a thin fold of tissue in the inner corner of the eye. In some animals, it serves a functional purpose, like protecting the eye and keeping it moist. However, in humans, it has no significant function and is considered vestigial.

5. **Conclusion**:
- Therefore, the vestigial organ of humans from the given options is the **Nictitating Membrane**.

**Final Answer**: The vestigial organ of humans is the Nictitating Membrane.

---