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 ultimate goal of all epidemiological studies is: \nSelect and explain. \nA. Control of disease, B. Disruption of disease, C. Identification of disease, D. Quantification of disease', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The ultimate goal is control of disease.', 'role': 'assistant'}]