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': 'An investigator while investigating the life expectancy of i.v 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. Ratio', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Likert Scale:\n–\xa0 Is also known as ‘Summative scale’\n–\xa0 Is a ‘type of Ordinal scale’\n–\xa0 Is generally used to quantify attitudes and behaviour\n–\xa0 ‘Responses are graded on a continuum’ (For example: Strongly agree – Agree – Neutral – Disagree-\xa0 \xa0Strongly disagree).\nGuttman Scale:\n–\xa0 Is also known as ‘Cumulative scale’\n–\xa0 Contains a ‘series of statements that expresses increasing intensity’ of a characteristic and respondent is asked\xa0to agree or disagree to with each statement.\nNote:\nIn the given question, an investigator, investigating the life expectancy of IV drug abusers divides a sample of patients into HIV- positive and HIV- negative groups; Since there is no order of characteristic and it cannot be measured directly, it can’t be an ordinal data or metric data respectively. Thus it is nominal data (based only on names, i.e. HIV- positive and HIV- negative groups).', 'role': 'assistant'}]