Middle ear contains

Options

A. Fluid
B. Blood
C. air
D. Wax.

Answer

### Step-by-Step Solution:

1. **Understanding the Structure of the Ear**: The ear is divided into three main parts: the outer ear, the middle ear, and the inner ear. Each part has distinct functions and components.

2. **Identifying the Middle Ear**: The middle ear is located between the outer ear and the inner ear. It is an air-filled space that plays a crucial role in hearing.

3. **Components of the Middle Ear**: The middle ear contains three small bones known as the ossicles: the malleus (hammer), incus (anvil), and stapes (stirrup). These bones are responsible for transmitting sound vibrations from the eardrum to the inner ear.

4. **Analyzing the Options**:
- **Fluid**: While the inner ear contains cochlear fluid, the middle ear does not contain fluid.
- **Blood**: Blood is not present in the middle ear.
- **Air**: The middle ear is a hollow space known as the tympanic cavity, which is filled with air.
- **Wax**: Earwax is found in the outer ear, not the middle ear.

5. **Conclusion**: Based on the analysis, the correct answer is that the middle ear contains **air**.

### Final Answer:
The middle ear contains **air**.

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