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
While using a periodontal probe to measure the depth of
the periodontal pocket the pocket is measured from: 
Select and explain. 
A. Free gingival margin to the cementoenamel junction, B. Junctional epithelium to the free gingival margin, C. Base of pocket to the cementoenamel junction, D. Base of pocket to mucogingival junction
B: Junctional epithelium to the free gingival margin
Answer: B: Junctional epithelium to the free gingival margin 
Explanation: None