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: Pathology
The % of coincidence between sore throat and acute rheumatic fever is - 
Select and explain. 
A. 3%, B. 5%, C. 7%, D. 9%
A: 3%
Answer: A: 3% 
Explanation: Ans. is 'a' i.e., 3% Only a small propoion of patients with streptococcal pharyngeal infection develops Rheumatic fever. Attack rate is less than 3%