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
[{'content': 'The electronic probing system "Foster Miller Probe" detects: \nSelect and explain. \nA. Only the pocket depth, B. Only the CEJ, C. CEJ and pocket depth, D. Furcation involvement', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]