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: Dental
[{'content': 'All of the following are example of nominal scale except: \nSelect and explain. \nA. Race, B. Sex, C. Body weight, D. Socio-economic status', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]