This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other hea diseases in children, Subject name: Pediatrics
According to American hea association & world hea federation 2015 criteria, low risk is defined as having An Acute Rheumatic Fever incidence <---------- per 100,000 school aged children per year? 
Select and explain. 
A. 1, B. 2, C. 0.1, D. 0.01
B: 2
Answer: B: 2 
Explanation: - As per AHA & world hea federation 2015 criteria: Low risk is defined as having an Acute Rheumatic Fever incidence <2 per 100,000 school aged children (5-14 yrs) /year or Prevalence of RHD of <1 per 1000 population per year .