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
Health education charts serially flashed to the groups while talking are known as? 
Select and explain. 
A. Flannel graph, B. Flip charts, C. Flash cards, D. Exhibition charts
B: Flip charts
Answer: B: Flip charts 
Explanation: Answer is self-explanatory.