Why do some countries require students to undergo a medical examination before being granted a student visa?
Some countries want to ensure that students meet certain health standards and do not pose a risk to public health.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Why do some countries require students to undergo a medical examination before being granted a student visa?

### Input: Not applicable

### Response:
Some countries want to ensure that students meet certain health standards and do not pose a risk to public health.<|im_end|>