This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Chandlers index is - \nSelect and explain. \nA. Potential danger to community, B. No danger, C. Minor public health problem, D. Major public health problem', 'role': 'user'}, {'content': 'Answer: A \nExplanation: <p> Potential danger to the community. Reference:Park&;s textbook of preventive and social medicine,K.Park,21stvedition,page no:221.22nd edition,pg no:221. <\\p>', 'role': 'assistant'}]