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

Options

A. Trimethylamine
B. Hydrogen sulphide
C. Ammonia
D. Lactic acid

Answer

**Step-by-Step Solution:**

1. **Understanding Marine Teleosts**: Marine teleosts are a category of fish that live in seawater. They undergo various physiological changes after death, which can lead to putrefaction.

2. **Defining Putrefaction**: Putrefaction is the process of decomposition that occurs post-mortem. It involves the breakdown of proteins and tissues, leading to the liquefaction of organs.

3. **Role of Microorganisms**: During putrefaction, bacteria and fungi play a crucial role in decomposing the proteins and tissues of the marine teleosts.

4. **Production of Odorous Compounds**: One of the key compounds produced during the putrefaction of marine teleosts is Trimethylamine. This compound is known for its sharp, characteristic foul odor.

5. **Mechanism of Odor Production**: Trimethylamine is a soluble and non-toxic substance. During the putrefaction process, it gets oxidized by an enzyme called Trimethylamine oxidase, which contributes to the foul smell associated with decomposing marine teleosts.

6. **Other Compounds Considered**:
- Hydrogen Sulfide: Known for its rotten egg smell, but it is not the primary cause of the characteristic odor in marine teleosts.
- Ammonia: Has a smell similar to urine, which is also not the specific foul odor associated with marine teleosts.
- Lactic Acid: An organic acid that does not have a specific characteristic foul smell.

7. **Conclusion**: The foul odor emitted during the putrefaction of marine teleosts is primarily due to the production of Trimethylamine.

**Final Answer**: Trimethylamine.

---