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': 'Which of the following variables is measured on the ordinal scale- \nSelect and explain. \nA. Type of anemia, B. Severity of anemia, C. Hemoglobin, D. Serum ferritin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: When data is ranked e.g. mild, moderate, severe\xa0 → ordinal scale is used. Therefore the severity of anemia is measured on the\xa0ordinal scale.\nType of anemia can be divided into qualitative categories (Macrocytic/microcytic, hemolytic/non-hemolytic) →\xa0Nominal scale is used.\nSerum ferritin and hemoglobin are quantitative variables with a possible absolute zero value → Ratio scale is used.', 'role': 'assistant'}]