This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
[{'content': 'Like scale is? \nSelect and explain. \nA. Ordinal scale, B. Nominal scale, C. Variance scale, D. Categorical scale', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]