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
Relative risk is represented by ? 
Select and explain. 
A. Incidence among exposed/incidence among non-exposed, B. Incidence among non-exposed/incidence among exposed, C. Incidence in exposed minus incidence in non-exposed, D. None of the above
A: Incidence among exposed/incidence among non-exposed
Answer: A: Incidence among exposed/incidence among non-exposed 
Explanation: Ans. is 'a' i.e., Incidence among exposed/incidence among nonexposed