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
The relative risk of 1 indicates that 
Select and explain. 
A. There is no cause effect relationship, B. Effect may be due to type 1 error, C. Strong correlation, D. Effect may be due to type 2 error
A: There is no cause effect relationship
Answer: A: There is no cause effect relationship 
Explanation: Relative risk is the ratio of the incidence of the disease (or death) among exposed and the incidence among non-exposed. A relative risk of 1 means the incidence in exposed and non-exposed is same. So there is no relation between disease and cause (exposure). Park, pg: 79