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
[{'content': 'The unit of measurement used in bacteriology is \nSelect and explain. \nA. Micron, B. Millimeter, C. Angstrom, D. Nanometer', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Unit of measurement used in bacteriology is the micron Ref: Anantanarayan; 7th edition; Page no: 7', 'role': 'assistant'}]