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': 'Web of causation of disease, which statement is most appropriate? \nSelect and explain. \nA. Mostly applicable for common diseases, B. Requires complete understanding of all factors associated with causation of disease, C. Epidemiological ratio, D. Helps to suggest ways to interrupt the risk of transmission', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]