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 pattern of bone destruction in periodontitis is\ndetermined by: \nSelect and explain. \nA. Depth of the pockets, B. Suppuration, C. Pathway of inflammation, D. Composition of plaque', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]