This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'A pay was attended by 110 people out of which 40 didn&;t eat fruit salad. From the rest who ate fruit salad, 55 didn&;t develop food poisoning. What is the attack rate? \nSelect and explain. \nA. 46, B. 56, C. 78, D. 50', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Attack Rate= No. of new cases of a disease/ Total population at risk * 100 In the given question, No of new cases = 55 Total population at risk= 110-40 = 70 who ate fruit salad. So, AR= 55/70*100 = 78.6% Ref: Parl 25th edition Pgno: 69', 'role': 'assistant'}]