The middle ear of Rana tigrina has
1) Three ear ossicles i.e. malleus, incus and stapes
2) One ear ossicles columella auris
3) Two ear ossicles columella auris and stapedial plate
4) No ear ossicle

Options

A. Three ear ossicles i.e. malleus, incus and stapes
B. One earh ossicles columella auris
C. Two ear ossicles columella auris and stapedial plate
D. No ear ossicle

Explanation

To answer the question about the middle ear of Rana tigrina, we need to analyze the options provided and understand the anatomy of the frog's ear.

### Step-by-Step Solution:

1. **Identify Rana tigrina**:
- Rana tigrina is the scientific name for the common frog. Understanding the species is crucial as it sets the context for the anatomical features we are discussing.

2. **Understand the structure of the frog's ear**:
- The frog's ear consists of three main parts: the external ear, the middle ear, and the inner ear. The middle ear is particularly important for sound transmission.

3. **Identify the ear ossicles in Rana tigrina**:
- In mammals, the middle ear contains three ossicles: malleus, incus, and stapes. However, in frogs, there is a different structure.
- Frogs have only one ear ossicle known as the columella auris.

4. **Function of the columella auris**:
- The columella auris transmits sound vibrations from the external environment to the inner ear. It is homologous to the stapes in mammals, meaning it serves a similar function but is a different structure.

5. **Evaluate the options**:
- **Option 1**: Three ear ossicles (malleus, incus, stapes) - Incorrect, as frogs do not have these.
- **Option 2**: One ear ossicle (columella auris) - Correct, as this is the only ossicle present in Rana tigrina.
- **Option 3**: Two ear ossicles (columella auris and stapedial plate) - Incorrect, as there is only one ossicle.
- **Option 4**: No ear ossicle - Incorrect, as there is indeed one ossicle.

6. **Conclusion**:
- The correct answer is **Option 2: One ear ossicle (columella auris)**.