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 type of variable “Social Class” is, if it has four categories-I to V and Class I is the highest social class and Class V is the lowest? \nSelect and explain. \nA. Dichotomous, B. Ordinal, C. Nominal, D. Interval', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]