Which one is used in balancing ?

Options

A. Organ of Corti
B. Vestibular region
C. Middle ear
D. Cochlea.

Answer

To solve the question "Which one is used in balancing?" we will analyze the options provided and determine which structure is responsible for balance in the human body.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which structure is used for balancing. This implies we need to identify the part of the ear or associated structures that are responsible for maintaining balance.

2. **Identifying the Options**: The options given are:
- Organ of Corti
- Vestibular region
- Middle ear
- Cochlea

3. **Analyzing Each Option**:
- **Organ of Corti**: This structure is located in the cochlea and is primarily involved in hearing. It is not responsible for balance.
- **Vestibular Region**: This part of the inner ear is specifically involved in balance. It includes structures like the semicircular canals, saccule, and utricle, which detect changes in head position and motion.
- **Middle Ear**: This part of the ear is involved in transmitting sound vibrations to the inner ear but does not play a role in balance.
- **Cochlea**: This structure is also involved in hearing, converting sound waves into neural signals, and is not involved in balance.

4. **Conclusion**: Based on the analysis, the vestibular region is the correct answer as it is responsible for maintaining balance in the body.

### Final Answer:
The correct answer is **Vestibular region**.