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. Portion', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In the question, data has been divided into two groups, i.e. HIV positive/HIV negative → Data should be measured\xa0on the nominal scale especially Dichotomous type of nominal scale.', 'role': 'assistant'}]