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': 'Necrotizing Ulcerative Gingivitis has been demonstrated to be \nSelect and explain. \nA. Communicable but not transmissible, B. Both communicable and transmissible, C. Transmissible but not communicable, D. Neither transmissible nor communicable', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]