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
The electronic probing system "Foster Miller Probe" detects: 
Select and explain. 
A. Only the pocket depth, B. Only the CEJ, C. CEJ and pocket depth, D. Furcation involvement
C: CEJ and pocket depth
Answer: C: CEJ and pocket depth 
Explanation: None