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
Strong correlation is signified by a correlation coefficient of: 
Select and explain. 
A. Zero, B. 1, C. Less than 1, D. More than 1
B: 1
Answer: B: 1 
Explanation: CORRELATION COEFFICIENT (R):

Measures the degree or strength of relationship in a correlation (relationship between 2 quantitative or continuous variables).
Correlation coefficient (r) lies between: –1 to +1 (–1 < r < +1)
Strength of correlation:


Weak positive correlation: 0 < r < 0.3
Moderate positive correlation: 0.4 < r < 0.6
Strong positive correlation: r > 0.7