Polychlorinated biphenyls (PCBs) are
I. non - carcinogenic in nature
II. Carcinogenic in nature
III. Used as cleansing solvent
Choose the correct options

Options

A. Both I and III
B. Both II and III
C. only II
D. only III

Answer

To solve the question regarding Polychlorinated biphenyls (PCBs), we need to analyze each statement provided:

1. **Statement I: Non-carcinogenic in nature**
2. **Statement II: Carcinogenic in nature**
3. **Statement III: Used as cleansing solvent**

### Step-by-Step Solution:

**Step 1: Analyze Statement I**
- PCBs are known to be harmful substances. Research and studies have shown that they can lead to cancer in humans and animals. Therefore, the statement that PCBs are non-carcinogenic is incorrect.

**Conclusion for Step 1:** Statement I is false.

**Step 2: Analyze Statement II**
- As mentioned earlier, PCBs are classified as carcinogenic. This means they have the potential to cause cancer. Therefore, this statement is true.

**Conclusion for Step 2:** Statement II is true.

**Step 3: Analyze Statement III**
- PCBs were historically used in various applications, including as dielectric fluids in electrical equipment and as cleaning solvents. Thus, this statement is also true.

**Conclusion for Step 3:** Statement III is true.

### Final Conclusion:
- From the analysis, we conclude that:
- Statement I is false.
- Statement II is true.
- Statement III is true.

Thus, the correct options are II and III.

### Answer:
The correct options are II and III (Carcinogenic in nature and Used as cleansing solvent).

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