In the zoological name of fish Catla catla, the specific name is identical with the generic name, thus it is an example of

Options

A. antonym
B. tautonym
C. synonym
D. homonym.

Explanation

To solve the question regarding the zoological name of the fish Catla catla, we need to identify the relationship between the generic name and the specific name. Here’s a step-by-step breakdown:

### Step 1: Understand the components of a scientific name
- A scientific name in zoology consists of two parts: the generic name (genus) and the specific name (species).
- In the case of Catla catla, "Catla" is the generic name, and "catla" is the specific name.

**Hint:** Remember that the first part of the name refers to the genus, while the second part refers to the species.

### Step 2: Identify the relationship between the generic and specific names
- The question states that the specific name is identical to the generic name. This means that both names are the same: Catla (genus) and catla (species).

**Hint:** Look for terms that describe names that are the same or identical.

### Step 3: Define the term that describes identical names
- When both the generic name and specific name are the same, it is referred to as a "tautonym."
- Tautonyms are a special case in nomenclature where the genus and species names are identical.

**Hint:** Recall that tautonyms are specific to biological nomenclature and are a unique way to name organisms.

### Step 4: Eliminate other options
- The other terms provided in the question are antonym, synonym, and homonym:
- Antonym: Words with opposite meanings.
- Synonym: Different words with the same meaning.
- Homonym: Words that sound the same but have different meanings.
- None of these terms apply to the situation where the genus and species names are identical.

**Hint:** Consider the definitions of the other terms and how they relate to the naming convention.

### Conclusion
- Since the specific name is identical to the generic name in the case of Catla catla, it is an example of a tautonym.

**Final Answer:** The correct answer is **tautonym**.