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: Social & Preventive Medicine
[{'content': 'Mode of transmission of Q fever: \nSelect and explain. \nA. Ticks, B. Mites, C. Aerosols, D. Mosquito', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ticks', 'role': 'assistant'}]