Fact 1: Viruses are so small that they can be seen only with an electron microscope.

Fact 2: Electron microscope is developed in Germany.

Given the two facts above, answer the question "viruses are so small that they can be seen only with a device developed where?" with the following options: 
- A computer
 - sunlight
 - Light
 - germany
 - retina
 - at home
 - canada
 - taiwan


 

    germany     