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': 'Health education charts serially flashed to the group as the talk is being given is called as \nSelect and explain. \nA. Flannel graph, B. Flash cards, C. Flip charts, D. Exhibition charts', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]