Q: 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, viruses are so small that they can be seen only with a device developed where?

(1). A computer (2). sunlight (3). Light (4). germany (5). retina (6). at home (7). canada (8). taiwan
The answer is:
(4).