Name the black thick liquid substance used in synthetic dyes, explosive, photographic materials:

Options

A. Coke
B. Coal tar
C. Coal gas
D. None of these

Explanation

To solve the question "Name the black thick liquid substance used in synthetic dyes, explosive, photographic materials," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Key Characteristics**: The question specifies a "black thick liquid substance." This indicates that we are looking for a viscous liquid that is dark in color.

2. **Consider Possible Substances**: We need to think about substances that fit the description of being a black thick liquid. Common candidates could include coal tar, coal gas, and coke. However, we need to focus on the liquid state.

3. **Eliminate Non-Liquid Options**:
- **Coke**: This is a solid form of carbon derived from coal and does not fit the description of a liquid.
- **Coal Gas**: This is a gaseous substance and therefore also does not meet the criteria of being a thick liquid.

4. **Identify the Correct Substance**: The substance that fits the description of a black thick liquid and is used in synthetic dyes, explosives, and photographic materials is **coal tar**.

5. **Conclusion**: Therefore, the answer to the question is **coal tar**.

### Final Answer:
Coal tar

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