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
In house with 9 susceptible individuals 1 gets infected and other two get infected after two days what is the secondary attack rate ? 
Select and explain. 
A. 25%, B. 33%, C. 50%, D. 65%
A: 25%
Answer: A: 25% 
Explanation: Ans. is 'a' i.e., 25%