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': 'What histologic criteria is used to distinguish gingivitis from periodontitis \nSelect and explain. \nA. Occlusal trauma, B. Howships lacunae, C. Bone Resorption, D. Endosteal Proliferation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]