Marine teleosts, undergoing putrefaction, emit sharp characteristic foul odor, which is due to the production of

Options

A. Trimethylamine
B. Hydrogen sulfide
C. Ammonia
D. Lactic Acid

Answer

To answer the question regarding the foul odor emitted by marine teleosts undergoing putrefaction, we can break down the solution step by step.

### Step-by-Step Solution:

1. **Understanding Marine Teleosts**:
- Marine teleosts are bony fish that primarily inhabit marine environments. They are known for their ability to regulate their internal environment despite the saltwater surroundings.

2. **Excretion in Marine Teleosts**:
- Marine teleosts are classified as ammonotelic organisms, meaning they excrete nitrogenous waste primarily in the form of ammonia. This is due to their aquatic environment, which allows for the dilution of ammonia in water.

3. **Putrefaction Process**:
- Putrefaction refers to the decomposition of organic matter, which occurs when the fish dies. During this process, bacteria break down the organic materials, leading to the release of various compounds.

4. **Production of Foul Odor**:
- One of the key products of putrefaction is trimethylamine (TMA), which is produced from the breakdown of amino acids and other nitrogenous compounds. Trimethylamine has a strong, fishy odor that is often described as foul.

5. **Conclusion**:
- Therefore, the sharp characteristic foul odor emitted by marine teleosts undergoing putrefaction is primarily due to the production of trimethylamine.

### Final Answer:
The foul odor emitted by marine teleosts undergoing putrefaction is due to the production of trimethylamine.