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
All of the following are quantitative variables except 
Select and explain. 
A. Gender, B. Weight, C. Serum cholesterol, D. Celsius temperature scale
A: Gender
Answer: A: Gender 
Explanation: Variable: Is a characteristic or attribute that vary from person to person, from time to time and from person to person