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: Social & Preventive Medicine
[{'content': 'The incidence rates of Clostridium difficile are measured in both hospitals and nursing homes throughout a particular county. Those with low rates of infection were marked as having an effective nosocomial infection prevention strategy, while those with high rates were marked as having an ineffective strategy \nIf the Department of Health Services wishes to determine whether hospitals or nursing homes have a more effective nosocomial infection prevention strategy, which of the following would be most appropriate? \nSelect and explain. \nA. Chi-squared test, B. One-way analysis of variance, C. Paired t-test, D. Pearson correlation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]