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
A scatter diagram was plotted as shown below to study the relationship between two variables. This is an example of: 
Select and explain. 
A. High positive correlation, B. High negative correlation, C. Low positive correlation, D. Low negative correlation
D: Low negative correlation
Answer: D: Low negative correlation 
Explanation: None