This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Variables, Scales, Subject name: Social & Preventive Medicine
[{'content': "A physician, after examining a group of patients of a ceain disease, classifies the condition of each one as 'Normal', 'Mild', 'Moderate' or 'Severe'. Which one of the following is the scale of measurement that is being adopted for classification of the disease condition? \nSelect and explain. \nA. Normal, B. Interval, C. Ration, D. Ordinal", 'role': 'user'}, {'content': "Answer: D \nExplanation: In the given question, a physician, after examining a group of patients of a ceain disease, classifies the condition of each one as 'Normal', 'Mild', 'Moderate' or 'Severe'. 'Normal-mild-moderate-severe' is a continuum of outcome for a variable, thus is measured on an Ordinal scale.", 'role': 'assistant'}]