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': 'All of the following are quantitative variables except \nSelect and explain. \nA. Gender, B. Weight, C. Serum cholesterol, D. Celsius temperature scale', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Variable: Is a characteristic or attribute that vary from person to person, from time to time and from person to person', 'role': 'assistant'}]