Which is not a contact poison

Options

A. DDT
B. BHC
C. Endrin
D. Lead arsenate

Answer

To determine which of the given options is not a contact poison, we need to understand what a contact poison is and analyze each option accordingly.

### Step-by-Step Solution:

1. **Define Contact Poison**: A contact poison is a type of pesticide that causes harm to the target organism primarily through skin absorption or physical contact, rather than through inhalation or ingestion.

2. **Analyze the Options**:
- **DDT (Dichloro-Diphenyl-Trichloroethane)**: This is a well-known insecticide that acts as a contact poison. It works by being absorbed through the skin of insects.
- **BHC (Benzene Hexachloride)**: This is another pesticide that also functions as a contact poison. It affects insects upon contact.
- **Andrine**: This is a chemical compound used as a pesticide and acts similarly as a contact poison.
- **Lead**: Lead is a heavy metal that is toxic but does not act primarily as a contact poison. It can cause harm through ingestion or inhalation rather than skin contact.
- **Arsenate**: This is a compound containing arsenic, which is toxic but does not act as a contact poison. It can be harmful through ingestion or inhalation.

3. **Identify the Correct Answer**: Among the options, Lead is the substance that does not act as a contact poison. Therefore, the correct answer is **Lead**.

### Final Answer:
The option that is not a contact poison is **Lead**.

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