Which set is of beneficial insects, to man -

Options

A. Honey bee, Lac insect, cochineal insect
B. Silk worm, honey bee, wasp
C. Honey bee, silk worm, cockroach
D. None of the above

Answer

To determine which set of insects is beneficial to humans, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Analyze Option A: Honey bee, Lac insect, Cochineal insect**
- **Honey bee**: Known for producing honey and beeswax, and plays a crucial role in pollination, making it highly beneficial to humans.
- **Lac insect**: Produces lac, which is used in various products, including jewelry and varnishes. This insect is also beneficial.
- **Cochineal insect**: Used for producing carminic acid, which is a dye, and helps control certain cactus species. This insect is also beneficial.
- **Conclusion**: All three insects in this option are beneficial to humans.

2. **Analyze Option B: Silkworm, Honey bee, Wasp**
- **Silkworm**: Produces silk, which is economically important.
- **Honey bee**: As mentioned, it produces honey and wax and aids in pollination.
- **Wasp**: While some wasps can be beneficial for pest control, they do not have significant economic importance compared to the other two.
- **Conclusion**: This option is not entirely beneficial due to the wasp.

3. **Analyze Option C: Honey bee, Silkworm, Cockroach**
- **Honey bee**: Beneficial as previously discussed.
- **Silkworm**: Beneficial for silk production.
- **Cockroach**: Generally considered a pest, known for spreading diseases and having no economic value.
- **Conclusion**: This option is not beneficial due to the cockroach.

4. **Analyze Option D: None of the above**
- Since Option A is entirely beneficial, this option is incorrect.

### Final Answer:
The correct answer is **Option A: Honey bee, Lac insect, Cochineal insect**.