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 number of new cases of a specific disease occurring in a defined population during a specified period of time is known as \nSelect and explain. \nA. Incidence, B. Point prevalence, C. Distribution, D. Prevalence', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]