This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
DNA probes: 
Select and explain. 
A. Measure periodontal pocket depth., B. Identify a particular microorganism, C. Calculate the length of gingival epithelial attachment, D. None of the above
B: Identify a particular microorganism
Answer: B: Identify a particular microorganism 
Explanation: None