This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Microbiology Pa 1 (History, Microscopy, Stains and Structure and Physiology of Bacteria), Subject name: Microbiology
Who is the founder of Electron microscope? 
Select and explain. 
A. Antonie Philips van Leeuwenhoek, B. Ernst Ruska, C. Robe Koch, D. Louis Pasteur
B: Ernst Ruska
Answer: B: Ernst Ruska 
Explanation: Ernst August Friedrich Ruska was a German physicist who won the Nobel Prize in physics in 1986 for his work in electron optics, including the deign of the first electron microscope.