An organochlorine insecticide is

Options

A. DDT/aldrin
B. Malathion
C. Tetraethyl pyrophophate
D. Thiocarbamate

Answer

To determine which of the given options is an organochlorine insecticide, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Organochlorine Insecticides**:
- Organochlorine insecticides are a group of compounds that contain carbon, hydrogen, and chlorine. They are characterized by higher molecular weights and lower volatility compared to other chlorinated hydrocarbons.

2. **Examine the Options**:
- **Option 1: DDT or Aldrin**: DDT (Dichloro-Diphenyl-Trichloroethane) is a well-known organochlorine insecticide. Aldrin is also an organochlorine compound. Therefore, this option is likely correct.
- **Option 2: Malathion**: This is a man-made organophosphate insecticide, not an organochlorine. So, this option is incorrect.
- **Option 3: Tetraethyl Pyrophosphate (TEPP)**: This is also an organophosphate compound and not an organochlorine insecticide. Thus, this option is incorrect.
- **Option 4: Thiocarbamate**: Thiocarbamates belong to the family of organosulfur compounds and are not classified as organochlorine insecticides. This option is also incorrect.

3. **Conclusion**:
- Based on the analysis of the options, the correct answer is **Option 1: DDT or Aldrin**, as both are classified as organochlorine insecticides.

### Final Answer:
**DDT or Aldrin**

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