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
Epidemiology is primarily concerned with the: 
Select and explain. 
A. 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
B: Occurrence and distribution of disease in the population
Answer: B: Occurrence and distribution of disease in the population 
Explanation: Epidemiology: 
Epidemiology 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
Soben Peter 
Essentials of preventive and community dentistry 
4th edition