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': 'If the pocket depth is 5 mm and gingival recession\nis 3 mm then the total loss of attachment is: \nSelect and explain. \nA. 8 mm, B. 3 mm, C. 5 mm, D. 2 mm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]