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': 'Accidents happening during weekends is \nSelect and explain. \nA. Cyclic trends, B. Seasonal trends, C. Secular trends, D. Point source epidemic', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]