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 measure on ordinal scale - \nSelect and explain. \nA. Type of anemia, B. Severity of anemia, C. Hemoglobin, D. Serum ferritin', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., severity of anemia When data is ranked e.g. mild, moderate, severe --) ordinal scale is used. Therefore severity of anemia is measured on ordinal scale. Type of anemia can be divided into qualitative categories (Macrocytic/microcytic, hemolytic/non-hemolytic) --> Nominal scale is used. Serum ferritin and hemoglobin are quantiative variables with a possible absolute zero value Ratio scale is used.", 'role': 'assistant'}]