This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Health education & planning, Subject name: Social & Preventive Medicine
[{'content': 'Flipchas are used in \nSelect and explain. \nA. Demonstrations, B. Lectures, C. Symposium, D. Workshops', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The lecture method can be made more effective by combining with suitable audio-visual aids such as - Flipchas, Flannelgraph, Exhibits, Films and chas.Flipchas are series of chas or posters, flashed or displayed before a group as talk is being given.Park 23e pg: 864', 'role': 'assistant'}]