This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
A study found relative risk of passive smoking to have depression to be 1.05. what is interpretation? 
Select and explain. 
A. Positive association, B. No association, C. Negative association, D. Not significant
A: Positive association
Answer: A: Positive association 
Explanation: - R.R = Ie/ Ine - Interpretation of Relative risk RR > 1 Positive association RR = 1 No association RR < 1 Negative/ Inverse association - As question stated RR 1.05; it shows positive association