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': 'Epidemiology is primarily concerned with the: \nSelect and explain. \nA. Identification of the agent causing disease in the host, B. Occurrence and distribution of disease in the population, C. Predisposing factors to disease, D. Relationship between organisms and their environment', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Epidemiology:\xa0\nEpidemiology is defined as the study of the distribution and determinants of health related states or events in specified populations, and the application of this study to the control of health problems. - John M. Last\nSoben Peter\xa0\nEssentials of preventive and community dentistry\xa0\n4th edition', 'role': 'assistant'}]