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': 'Lice is a vector of all of the following except: \nSelect and explain. \nA. Q fever, B. Epidemic typhus, C. Relapsing Fever, D. Trench fever', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]