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': 'Like scale is: \nSelect and explain. \nA. Ordinal, B. Nominal, C. Variance, D. Categorical', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ordinal', 'role': 'assistant'}]