This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
Length of most of the bacteria of medical impoance are about? 
Select and explain. 
A. 0.5-1 micron, B. 1-3 micron, C. 3-5 micron, D. 5-10 micron
C: 3-5 micron
Answer: C: 3-5 micron 
Explanation: The limit of resolution with the unaided eye is about 200 microns bacteria being much smaller can be visualized only under magnification. Bacteria of medical impoance generally measures 0.2-1.5 um in diameter and about 3-5 um in length Ref: Ananthanarayan & paniker's Textbook of Microbiology 9th edition pg no 10