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': 'An investigator into the life expectancy of IV drug abusers divides a sample of patients into HIV positive and HIV negative groups. What type of data does this division constitute ? \nSelect and explain. \nA. Nominal, B. Ordinal, C. Interval, D. Poion', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is `a' i.e., Nominal In the question, data has been divided into two groups, i.e. HIV positive/HIV negative Data should be measured on nominal scale especially Dichotomous type of nominal scale.", 'role': 'assistant'}]