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': 'A periodontal pocket of 6 mm deep lying coronal to the\njunctional epithelium is: \nSelect and explain. \nA. Infrabony pocket, B. Periodontal pocket, C. True pocket, D. Pseudopocket', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]