In laboratory burners, we use

Options

A. Producers gas
B. Oil gas
C. Gobar gas
D. Coal gas

Explanation

To answer the question "In laboratory burners, we use", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Purpose of Laboratory Burners**: Laboratory burners are used for heating substances, conducting experiments, and providing a controlled flame.

2. **Determine Common Fuel Sources**: The common fuel sources for laboratory burners include natural gas, propane, and oil gas.

3. **Define Oil Gas**: Oil gas is a mixture of various gases, primarily used for heating purposes. It typically contains:
- Methane (CH₄)
- Carbon monoxide (CO)
- Carbon dioxide (CO₂)
- Hydrogen (H₂)

4. **Conclude the Main Fuel Used**: Based on the information gathered, the primary fuel used in laboratory burners is oil gas, which is a mixture of the gases mentioned above.

5. **Select the Correct Option**: If provided with multiple-choice options, the correct answer would be the one that states "oil gas".

### Final Answer:
In laboratory burners, we use oil gas.