Name the substance which is used in paints, road surfacing :

Options

A. Lubricating oil
B. Petrol
C. Bitumen
D. Paraffin wax

Explanation

To answer the question, "Name the substance which is used in paints and road surfacing," we will evaluate the options provided and determine which substance fits the criteria.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are lubricating oil, petrol, bitumen, and paraffin wax.

2. **Evaluate Lubricating Oil**:
- **Function**: Lubricating oil is primarily used to reduce friction between moving parts.
- **Conclusion**: It is not used in paints or road surfacing. Therefore, this option can be eliminated.

3. **Evaluate Petrol**:
- **Function**: Petrol is a volatile liquid used primarily as fuel.
- **Conclusion**: It evaporates easily and is not suitable for use in paints or road surfacing. This option can also be eliminated.

4. **Evaluate Bitumen**:
- **Function**: Bitumen is a thick, sticky substance derived from coal and is commonly used in road construction and surfacing.
- **Conclusion**: Bitumen is indeed used in road surfacing and can also be used in some types of paints. This option is a strong candidate.

5. **Evaluate Paraffin Wax**:
- **Function**: Paraffin wax is often used in candles and as a coating for various products, but it is not typically used in road surfacing.
- **Conclusion**: While it can be used in paints, it is not the primary substance for road surfacing. This option can be eliminated.

6. **Final Decision**:
- After evaluating all the options, **bitumen** is the substance that is used in both paints and road surfacing. Therefore, the correct answer is **bitumen**.

### Final Answer:
The substance used in paints and road surfacing is **bitumen**.