## **Core Concept**
The size of the diameter of mosquito net holes is crucial for preventing the entry of mosquitoes while allowing for airflow. Mosquito nets are a preventive measure against mosquito-borne diseases like malaria, dengue, and Zika virus. The effectiveness of a mosquito net depends on the size of its holes.
## **Why the Correct Answer is Right**
The correct answer, , refers to a specific mesh size that is considered effective in preventing mosquito bites. A mesh size of is equivalent to 150-156 holes per square inch or a hole size of about 0.16 mm in diameter. This size is small enough to prevent *Anopheles* mosquitoes (which are the primary vectors of malaria) from passing through while still allowing for adequate ventilation.
## **Why Each Wrong Option is Incorrect**
- **Option A:** . This option suggests a larger hole size, which would be less effective in preventing mosquito bites as larger mosquitoes or other insects might pass through.
- **Option B:** . This option suggests an even smaller hole size, which, although more protective, might compromise on ventilation and visibility.
- **Option D:** . This option suggests a much larger hole size, making it significantly less effective against mosquitoes.
## **Clinical Pearl / High-Yield Fact**
A key fact to remember is that the standard mesh size for effective mosquito nets is around , which strikes a balance between protection and ventilation. Nets with this mesh size are widely recommended by public health organizations for malaria prevention.