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 cumulative effect of disease past and present upto the time of examination is termed \nSelect and explain. \nA. Incidence, B. Prevalence, C. Occurrence, D. Experience', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]