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: ENT
[{'content': 'Trench mouth is caused by \nSelect and explain. \nA. β - hemalytic streptococci, B. Borrelia vincenti, C. Epstein Barr virus, D. Diphtheria', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]