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
[{'content': 'The following term is used to describe the impact of school based health education programmes on parents. \nSelect and explain. \nA. Side effect, B. Secondary effect, C. Ripple effect, D. String effect', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]