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
A birthday party was attented by 200 people out of which 55 people develops food poisoning. what is the attack rate 
Select and explain. 
A. 25%, B. 27%, C. 30%, D. 35%
B: 27%
Answer: B: 27% 
Explanation: None